Diabetes in Dogs and Cats: Signs, Treatment and Insulin Care

Diabetes in Dogs and Cats: Signs, Treatment and Insulin Care

By Dr Duncan Houston

A dog or cat that suddenly empties the water bowl, produces enormous amounts of urine and loses weight despite eating well should be checked for diabetes.

Diabetes mellitus is treatable, but it should not be left to drift. Persistent high blood glucose can cause dehydration, muscle loss, infections, cataracts in dogs, nerve damage in cats and eventually diabetic ketoacidosis.

Dogs and cats also develop diabetes differently. Most diabetic dogs require insulin for life. Cats may receive insulin or, in carefully selected cases, an oral SGLT2 inhibitor. Some cats can enter diabetic remission, but dogs rarely do.

Quick Answer

Diabetes mellitus occurs when the body does not produce enough effective insulin to control blood glucose. The most common signs are increased thirst, increased urination, increased appetite and weight loss.

Clinical diabetes in dogs requires insulin treatment. Cats may be treated with insulin or, when they meet strict safety criteria, an oral SGLT2 inhibitor. Vomiting, refusal of food, marked weakness, dehydration, abnormal breathing, collapse or seizures require urgent veterinary care.

What Is Diabetes Mellitus?

Insulin is a hormone produced by beta cells within the pancreas. Its job is to help glucose move from the bloodstream into cells, where it can be used for energy.

When there is not enough insulin, or the body does not respond to insulin properly:

1. Blood glucose rises.

2. Glucose spills into the urine.

3. The glucose draws water with it, producing excessive urination.

4. The pet becomes increasingly thirsty to replace that water.

5. Calories are lost through the urine.

6. Fat and muscle are broken down for energy.

7. The pet may remain hungry while continuing to lose weight.

This is why the classic diabetic patient appears to be eating plenty but is effectively starving at a cellular level.

What Are the Signs of Diabetes in Dogs and Cats?

The signs usually develop gradually over several weeks or months.

Common signs include:

• Drinking more than normal

• Urinating more frequently

• Producing larger volumes of urine

• Having urinary accidents indoors

• Increased appetite

• Weight loss

• Muscle loss

• Reduced energy

• Dehydration

• Recurrent infections

• A dull or poorly maintained coat

Not every diabetic animal has an increased appetite. A pet with advanced diabetes, pancreatitis, diabetic ketoacidosis or another concurrent disease may eat less or stop eating completely. Appetite loss in a diabetic patient is more concerning than increased hunger.

Signs more commonly seen in diabetic dogs

Dogs may develop:

• Rapid cataract formation

• Cloudy or white-looking eyes

• Sudden visual impairment

• Recurrent urinary, skin or respiratory infections

• Weakness

• An enlarged liver

• Reduced exercise tolerance

Diabetic cataracts are common in dogs and may develop quickly. Cats rarely develop the same cataract complication.

Signs more commonly seen in diabetic cats

Cats may develop diabetic peripheral neuropathy, causing:

• Weak hind legs

• Difficulty jumping

• Walking with the hocks dropped towards the ground

• Reduced ability to climb stairs

• Muscle loss over the spine and hindquarters

This dropped-hock posture is called a plantigrade stance. It may improve once glucose control is restored, although recovery can take time.

How Worried Should You Be?

Risk level	What you may notice	What to do
Possible diabetes	Increased thirst, increased urination or mild weight loss, but still bright and eating	Arrange a veterinary appointment within the next few days
Likely or poorly controlled diabetes	Marked thirst, large urine volumes, ravenous appetite, ongoing weight loss, cataracts or weakness	Arrange assessment within 24 to 48 hours
Urgent	Reduced appetite, vomiting, diarrhoea, dehydration, marked lethargy, ketones or rapid weight loss	Seek same-day veterinary care
Critical	Collapse, seizures, inability to stand, severe weakness, reduced consciousness or abnormal breathing	Go to an emergency veterinary hospital immediately

A high glucose number alone does not determine urgency. A bright, eating pet with one high reading is usually less urgent than a diabetic pet with a lower reading that is vomiting, dehydrated and refusing food.

How Is Diabetes Different in Dogs and Cats?

Feature	Dogs	Cats
Typical underlying problem	Progressive loss of insulin-producing beta cells	Insulin resistance combined with impaired beta-cell function
Main treatment	Insulin	Insulin or an SGLT2 inhibitor in selected newly diagnosed cats
Need for lifelong insulin	Usually lifelong	May be temporary if remission occurs
Remission	Rare	Possible, particularly during the first months of treatment
Characteristic complication	Cataracts	Peripheral neuropathy and dropped hocks
Dietary priority	Consistent food, calories and meal timing	Higher protein, lower carbohydrate and appropriate body weight
Stress hyperglycaemia	Less common	Common and can complicate diagnosis

These differences are clinically important. Treating a diabetic cat exactly like a diabetic dog, or vice versa, is how sensible plans become unnecessarily chaotic.

What Causes Diabetes in Dogs?

Diabetes in dogs usually results from progressive damage or loss of the pancreatic beta cells that produce insulin.

Contributing causes and risk factors may include:

• Immune-mediated beta-cell destruction

• Pancreatitis

• Genetic susceptibility

• Obesity and insulin resistance

• Cushing’s syndrome

• High blood triglycerides

• Chronic inflammation or infection

• Glucocorticoid medication

• Progestogen medication

• Pregnancy or diestrus in an entire female dog

Progesterone can create severe insulin resistance in female dogs during diestrus. An intact female diagnosed with diabetes generally needs to be spayed once she is medically stable. In some hormonally driven cases, this can substantially improve regulation.

What Causes Diabetes in Cats?

Feline diabetes usually develops through a combination of insulin resistance, glucose toxicity and declining pancreatic beta-cell function.

Important contributing factors include:

• Obesity

• Reduced physical activity

• Loss of muscle

• Chronic pancreatitis

• Dental inflammation

• Chronic intestinal disease

• Urinary or other infection

• Glucocorticoid medication

• Progestogen medication

• Hyperthyroidism

• Hypersomatotropism, also called acromegaly

• Cushing’s syndrome

• Genetic susceptibility

Most affected cats have a disease pattern that resembles human type 2 diabetes, but the comparison is not perfect. Many cats still require injected insulin, particularly when they are systemically unwell or no longer producing enough of their own insulin to prevent ketosis.

Does Eating Sugar Cause Diabetes in Pets?

Diabetes is not usually caused by one sugary snack or one particular ingredient.

Obesity and chronic insulin resistance increase risk, especially in cats, but diabetes develops through a combination of pancreatic dysfunction, hormonal influences, medication exposure, genetics, inflammation and other disease.

The practical nutritional issue is total calorie intake, body condition and how the diet affects glucose control after diabetes has developed. Blaming one biscuit is emotionally satisfying but medically rather ambitious.

How Is Diabetes Diagnosed?

A diagnosis should not be based on one high blood glucose result alone, particularly in a cat.

The veterinary investigation usually includes:

• Full medical history

• Physical examination

• Accurate body weight

• Body and muscle condition assessment

• Complete blood count

• Serum biochemistry and electrolytes

• Blood glucose

• Urinalysis

• Urine glucose

• Ketone assessment when indicated

• Fructosamine in selected patients

• Testing for concurrent disease

Clinical diabetes is generally supported by the combination of compatible signs, persistent hyperglycaemia and glucose in the urine.

Why can diagnosing diabetes in cats be more difficult?

Cats can develop substantial stress hyperglycaemia during transport, handling or hospitalisation. A frightened cat can therefore have a high clinic glucose result without having persistent diabetes.

Current feline guidance recommends demonstrating sustained hyperglycaemia through one or more of the following:

• Increased fructosamine

• Repeated hyperglycaemia outside a stressful environment

• Repeated glucosuria at home

• Home glucometer readings

• Continuous glucose monitoring

Fructosamine reflects average glucose exposure over approximately the preceding week, although protein-losing disease and hyperthyroidism can affect its interpretation.

What else should be checked?

The veterinarian should also investigate problems that may have triggered the diabetes or may interfere with treatment.

Depending on the patient, this may include:

• Pancreatitis testing

• Total T4 in an older cat

• Blood pressure

• Urine culture

• Dental assessment

• Abdominal imaging

• Kidney testing

• Cushing’s testing in a dog

• IGF-1 testing for hypersomatotropism in a difficult diabetic cat

• Review of steroid and progestogen exposure

The goal is not simply to confirm that glucose is high. It is to understand why it is high and whether another illness is making the patient unstable.

What Else Can Cause Similar Signs?

Increased thirst, increased urination and weight loss are not exclusive to diabetes.

Important differential diagnoses include:

Chronic kidney disease

Kidney disease can cause thirst, increased urine production, weight loss, dehydration and poor appetite. Diabetes and kidney disease can also occur together.

Hyperthyroidism in cats

Hyperthyroidism commonly causes weight loss despite a normal or increased appetite. It may also increase thirst and urination and can worsen insulin resistance.

Cushing’s syndrome

Cushing’s is an important cause of insulin resistance, especially in dogs. Additional signs may include panting, a pot-bellied appearance, thin skin, recurrent infection and hair loss.

Liver disease

Liver and gallbladder disorders can cause increased thirst, appetite changes, vomiting, weight loss and abnormal bloodwork.

Pyometra

An entire female dog with increased thirst, lethargy, discharge, vomiting or a swollen abdomen may have a uterine infection rather than uncomplicated diabetes. Pyometra is an emergency.

Medication effects

Glucocorticoids and progestogens can cause increased thirst, increased urination and insulin resistance. Steroids may be hidden in ear drops, eye drops, creams, injections and inhaled medication.

The mistake is assuming that a diabetic-looking symptom pattern must have only one explanation. Senior animals are perfectly capable of collecting several diseases at once.

How Is Diabetes Treated?

The goals of treatment are to:

• Reduce excessive thirst and urination

• Stop inappropriate weight loss

• Restore normal energy and comfort

• Maintain a healthy body weight

• Avoid hypoglycaemia

• Prevent diabetic ketoacidosis

• Treat concurrent disease

• Preserve quality of life

The aim is not to make every glucose value identical to that of a healthy animal. Short periods of mild hyperglycaemia are usually safer than aggressive dosing that causes hypoglycaemia. Clinical signs and body-weight trends remain central to judging control.

How Is Diabetes Treated in Dogs?

Clinical diabetes in dogs requires injected insulin.

AAHA guidance recommends porcine lente insulin as a common first-choice option for dogs, although NPH, PZI, detemir and glargine formulations may be used in selected cases. Most diabetic dogs require treatment every 12 hours, with two consistent meals of similar calorie content offered around the injections.

Important parts of canine treatment include:

• Insulin at the prescribed dose and time

• Consistent meal size and composition

• Weight management

• Regular exercise at a reasonably consistent intensity

• Monitoring for hypoglycaemia

• Treatment of infections, pancreatitis or hormonal disease

• Spaying an intact diabetic female

• Eye monitoring for cataracts and inflammation

Naturally occurring canine diabetes rarely enters remission. Owners should usually prepare for lifelong insulin treatment, although the dose and insulin type may change.

How Is Diabetes Treated in Cats?

Cats have more treatment flexibility than dogs, but patient selection matters.

The main options are:

1. Insulin treatment

2. An oral SGLT2 inhibitor in a carefully selected newly diagnosed cat

3. Dietary and weight management alongside the chosen medication

4. Treatment of diseases causing insulin resistance

Insulin treatment in cats

Glargine U-100 and protamine zinc insulin are common feline choices because they generally provide a useful duration of action and reliable glucose control.

Other options include:

• Porcine lente insulin

• Glargine U-300

• Insulin degludec

• Other formulations selected for an individual patient

Lente insulin is not routinely preferred as the first feline option because its effect may be too short. NPH generally has an inadequate duration for cats. Glargine U-300 is a separate concentrated basal insulin and must not be treated as a simple three-times-strength version of glargine U-100.

Can cats take oral diabetes medication?

Bexagliflozin and velagliflozin are SGLT2 inhibitors approved in the United States for certain newly diagnosed diabetic cats.

They are not insulin. They reduce blood glucose by causing more glucose to leave through the urine.

They are intended for cats that:

• Are newly diagnosed

• Have not previously received insulin

• Are otherwise medically stable

• Are eating

• Are adequately hydrated

• Do not have diabetic ketoacidosis

• Do not have important contraindicating kidney, liver or pancreatic disease

They are not simply an easier substitute for insulin when an owner dislikes needles. An unwell, ketotic or insulin-dependent cat needs insulin.

What about glipizide?

Traditional oral drugs such as glipizide and metformin are not consistently safe or effective in diabetic cats and are no longer recommended as routine alternatives to insulin or an appropriately selected SGLT2 inhibitor.

What Are the Risks of SGLT2 Inhibitors?

SGLT2 inhibitors can cause diabetic ketoacidosis or euglycaemic diabetic ketoacidosis.

Euglycaemic DKA means the cat can have dangerous ketosis and acidosis without dramatically elevated blood glucose. A normal-looking glucose value can therefore provide false reassurance.

Blood beta-hydroxybutyrate monitoring is an important part of patient selection and ongoing treatment. Cats need particularly close monitoring during the first one to two weeks, although complications can occur later.

Stop the medication and contact a veterinarian immediately if a cat receiving an SGLT2 inhibitor develops:

• Reduced appetite

• Complete refusal of food

• Vomiting

• Diarrhoea

• Lethargy

• Hiding

• Dehydration

• Continued weight loss

• Weakness

• Difficulty walking

• Abnormal breathing

Cats currently receiving insulin or previously treated with insulin should not be switched to Bexacat or Senvelgo without following the strict product requirements. FDA safety information warns that withdrawing insulin and initiating an SGLT2 inhibitor can increase the risk of DKA, euglycaemic DKA and death.

How Do You Give Insulin Safely?

Most dogs and cats tolerate subcutaneous insulin injections surprisingly well. The needles are fine, and the injection usually takes only a few seconds.

The safety risks come from measuring errors, duplicate doses, incorrect storage and inappropriate dose changes.

Confirm these details before every injection

Check:

• The pet’s name

• The insulin name

• The concentration

• The prescribed number of units

• The correct syringe or pen

• The scheduled time

• Whether another person has already given the dose

Use a written log or shared app when more than one person is responsible for treatment.

Match the syringe to the insulin

The concentration and syringe must match:

• U-40 insulin requires a U-40 syringe

• U-100 insulin requires a U-100 syringe

• Insulins supplied for mandatory pen use should remain in the prescribed pen

Using the wrong syringe can result in a major overdose or underdose. Glargine U-300 and degludec U-200 are examples of concentrated insulins that should be administered using their appropriate pens.

Prepare each insulin correctly

Handling differs between products.

• Some insulin suspensions need gentle rolling or mixing.

• Porcine lente insulin must be shaken until uniformly milky.

• Clear insulin solutions should remain clear.

• Insulin should not be frozen, overheated or left in direct sunlight.

• Any product that becomes discoloured, clumped or unexpectedly cloudy should be replaced.

Follow the instructions for the exact insulin rather than applying one mixing rule to every vial. Insulin is annoyingly particular about being handled correctly, despite contributing very little to the household chores.

What if some insulin lands in the fur?

Do not immediately give another full dose.

You cannot know how much insulin entered the skin. Repeating the injection could cause an overdose and delayed hypoglycaemia.

Record the possible fur shot, monitor your pet and contact the veterinary clinic for advice.

What if a dose is missed?

Do not double the next dose.

The appropriate response depends on the insulin, how late the dose is and when the next dose is scheduled. Contact the veterinary clinic when practical. When immediate advice is unavailable, trying to catch up with extra insulin is usually more dangerous than one underdosed interval.

What if your pet refuses food?

There is no single rule that applies to every insulin and every patient.

A diabetic animal that refuses food may have nausea, pancreatitis, kidney disease, infection, DKA, hypoglycaemia or another important problem. Contact your veterinarian before giving the normal full dose, especially when vomiting, lethargy or weakness is present.

Every diabetic owner should receive written instructions covering:

• What counts as an adequate meal

• What to do after a partial meal

• What to do after a missed meal

• When to check glucose

• When to check ketones

• When to seek emergency care

What Is the Best Diet for a Diabetic Dog?

A diabetic dog can often do well on any complete and balanced diet that:

• Is eaten reliably

• Is fed in consistent quantities

• Is given at consistent times

• Supports an appropriate body weight

• Does not contain excessive simple sugars

• Is compatible with any concurrent disease

Increased dietary fibre may help some dogs by reducing the post-meal glucose rise and supporting weight loss. It is not automatically ideal for every dog, particularly one that is underweight or has gastrointestinal disease.

Most dogs receiving insulin every 12 hours are offered two equal meals, one around each injection. Treats must be included in the daily calories, and the amount and timing should remain reasonably consistent.

What Is the Best Diet for a Diabetic Cat?

Most diabetic cats benefit from a complete diet that is:

• High in protein

• Lower in digestible carbohydrate

• Appropriate in calories

• Suitable for their body condition

• Reliably accepted

Canned food is often preferred because it commonly contains less carbohydrate, supports water intake and makes portion control easier. However, reliable food intake is more important than forcing a theoretically ideal food that the cat refuses.

Meal feeding is useful because it makes appetite easier to assess, but it is not mandatory for every cat. A cat accustomed to grazing may continue eating several measured portions across the day, particularly when the daily allowance is controlled.

Weight management matters

An obese cat should lose weight gradually because weight reduction can improve insulin sensitivity.

An underweight cat needs adequate calories and protein to stop further muscle loss. Do not place a thin diabetic cat on a calorie-restricted weight-loss diet merely because the word “diabetic” appears on the food bag.

Diet changes can alter insulin requirements

Changing from a higher-carbohydrate food to a lower-carbohydrate diet may reduce insulin requirements quickly.

Glucose should be monitored during significant food changes. Continuing the previous insulin dose without reassessment may cause hypoglycaemia, particularly in a cat moving towards remission.

How Is a Diabetic Dog or Cat Monitored?

Good monitoring combines laboratory information with what is happening at home.

Record daily:

• Appetite

• Food quantity

• Water intake

• Urination

• Body weight when possible

• Insulin or medication dose

• Injection time

• Vomiting or diarrhoea

• Energy and behaviour

• Suspected missed doses

• Suspected fur shots

• Glucose or ketone results when prescribed

If thirst, urination and hunger settle while body weight stabilises, treatment is probably moving in the right direction. The goal is to control the patient, not win a beauty competition with the glucose graph.

Blood glucose curves

A glucose curve measures blood glucose repeatedly across an insulin dosing interval. It helps identify:

• How low glucose falls

• When the lowest value occurs

• How long the insulin works

• Whether the dose may be excessive

• Whether the insulin duration is too short

Home curves are generally preferred because they reflect the animal’s normal environment. Current feline guidance does not recommend routine in-hospital curves because stress can significantly distort the results.

Continuous glucose monitors

A continuous glucose monitor can provide several days of interstitial glucose trends.

It may reveal:

• Overnight lows

• Rapid fluctuations

• Inadequate insulin duration

• Possible remission

• Differences between daytime and nighttime control

Sensors are useful, but they do not replace clinical judgement. Unexpected low readings may need confirmation with a veterinary-calibrated blood glucose meter, particularly when the patient has no symptoms.

Fructosamine

Fructosamine estimates average glucose exposure over the preceding days to weeks.

It is useful for monitoring longer-term trends but cannot show:

• The exact timing of low glucose

• How long insulin is working

• Rapid daily fluctuations

• Whether one particular dose was missed

A normal fructosamine result also needs to be interpreted alongside body weight, appetite, thirst and home glucose information.

When are rechecks needed?

Many newly diagnosed insulin-treated patients are reassessed within 7 to 14 days.

Cats should generally have glucose monitoring:

• Five to fourteen days after starting insulin

• Five to fourteen days after a dose change

• Whenever diabetic signs return

• Whenever hypoglycaemia is suspected

Dose increases should not be made on the first day simply because glucose remains high. Regulation takes time, and overenthusiastic dose increases are a reliable way to turn a manageable disease into a hypoglycaemic emergency.

What Does Hypoglycaemia Look Like?

Hypoglycaemia means blood glucose has fallen too low.

Signs may include:

• Sudden hunger

• Restlessness

• Unusual sleepiness

• Strange behaviour

• Weakness

• Wobbliness

• A drunken-looking gait

• Trembling

• Muscle twitching

• Collapse

• Seizures

• Reduced consciousness

• Coma

Any abnormal neurological behaviour in a pet receiving insulin should be treated seriously.

What Should You Do During Hypoglycaemia?

If your pet is alert and able to swallow

1. Offer food immediately.

2. Check glucose if a suitable meter is available.

3. Do not give additional insulin.

4. Contact your veterinarian urgently.

5. Continue monitoring because glucose may fall again.

If your pet is weak, trembling or poorly responsive

1. Rub a small amount of plain glucose syrup, corn syrup or honey onto the gums.

2. Use a cotton-tipped applicator or syringe rather than your fingers.

3. Do not pour liquid down the throat.

4. Do not force food into an animal that cannot swallow safely.

5. Travel to a veterinarian or emergency hospital.

If your pet is unconscious or having a seizure

This is an emergency.

Apply syrup carefully to the gums only when it can be done safely, then leave for the nearest emergency veterinary hospital. Do not place your fingers between the teeth.

Improvement after sugar does not mean the emergency is over. Long-acting insulin may continue lowering glucose for several hours.

What Is Diabetic Ketoacidosis?

Diabetic ketoacidosis, or DKA, develops when there is not enough effective insulin to prevent excessive fat breakdown and ketone production.

This leads to:

• Dehydration

• Metabolic acidosis

• Electrolyte abnormalities

• Nausea

• Vomiting

• Weakness

• Progressive cardiovascular compromise

Common triggers include pancreatitis, infection, kidney disease, Cushing’s syndrome and interruption of treatment.

Signs include:

• Refusal of food

• Vomiting

• Marked lethargy

• Dehydration

• Rapid weight loss

• Weakness

• Sweet or unusual breath

• Rapid or laboured breathing

• Collapse

DKA requires hospital treatment with fluid therapy, insulin, electrolyte correction and treatment of the underlying disease. It is not managed by giving an extra insulin injection at home.

What is euglycaemic DKA?

Euglycaemic DKA is most relevant to cats receiving an SGLT2 inhibitor.

The cat develops ketosis and acidosis without the severe hyperglycaemia owners normally associate with DKA. This is why an unwell cat taking Bexacat or Senvelgo needs urgent ketone assessment even when the glucose result appears normal or only moderately high.

What Is Hyperosmolar Hyperglycaemic Syndrome?

Hyperosmolar hyperglycaemic syndrome, or HHS, is another serious diabetic emergency.

It involves extremely high glucose and blood hyperosmolality, often with profound dehydration and neurological abnormalities. Ketosis may be mild, absent or mixed with DKA.

Affected pets may show:

• Severe dehydration

• Marked weakness

• Altered consciousness

• Abnormal neurological behaviour

• Collapse

• Seizures

• Coma

HHS requires intensive hospital treatment.

Why Is a Diabetic Pet Hard to Regulate?

Persistent thirst, urination and weight loss do not automatically mean that the insulin dose needs to be increased.

The veterinary team should first check:

Insulin administration

• Correct insulin

• Correct syringe

• Correct dose measurement

• Correct storage

• Correct mixing

• Injection entering the skin

• Pen being primed

• Needle long enough to pass through the coat

• No missed or duplicate doses

Diet and weight

• Consistent daily calories

• Hidden treats

• Food stolen from other animals

• Obesity

• Ongoing muscle loss

• Recent food change

Medication

• Steroid tablets

• Steroid injections

• Ear or eye medication

• Skin creams

• Progestogens

• Other medication associated with insulin resistance

Concurrent disease

• Dental disease

• Pancreatitis

• Infection

• Kidney disease

• Chronic intestinal disease

• Cancer

• Cushing’s syndrome

• Hyperthyroidism

• Hypersomatotropism in cats

The first step in an unregulated patient is to audit insulin handling and observe the injection technique. True hormonal insulin resistance should be investigated after the basic delivery problems have been excluded.

When Is Diabetes an Emergency?

Seek immediate veterinary care if a diabetic dog or cat develops:

• Collapse

• Seizures

• Inability to stand

• Severe weakness

• Reduced consciousness

• Rapid or laboured breathing

• Repeated vomiting

• Complete refusal of food

• Marked dehydration

• Positive ketones with illness

• Suspected insulin overdose

• Severe wobbliness or tremors

• Rapid deterioration over several hours

Do not wait for the next scheduled glucose curve when the patient is clinically unwell.

What Should You Do Next?

If diabetes is only suspected

Arrange a veterinary appointment within the next few days.

Before the appointment, record:

• Water intake

• Urination frequency

• Appetite

• Recent weight changes

• Energy

• Vomiting or diarrhoea

• Current medication

• Any steroid exposure

• Whether an entire female dog is in season or recently finished a season

If diabetes has been diagnosed

Before taking medication home, confirm:

• The exact insulin or oral drug

• The concentration

• The number of units or measured dose

• The administration schedule

• The correct syringe or pen

• Product-specific storage instructions

• Product-specific mixing instructions

• What to do after a missed dose

• What to do after a partial meal

• What to do if vomiting occurs

• How to recognise hypoglycaemia

• When to check ketones

• Who to call after hours

• When the first recheck is due

During the first two weeks

Keep a detailed treatment log and watch appetite, water consumption, urination, weight, activity and neurological behaviour.

Cats receiving an SGLT2 inhibitor require particularly close monitoring for reduced appetite, vomiting, lethargy and ketosis during this period.

During long-term treatment

Continue:

• Consistent medication

• Measured food intake

• Weight monitoring

• Home glucose monitoring when prescribed

• Regular veterinary rechecks

• Dental and general health care

• Investigation of any loss of control

Insulin requirements change. A dose that was appropriate several months ago may become excessive after weight loss, treatment of infection or feline remission.

Common Mistakes Owners Should Avoid

Waiting for severe weight loss

Persistent thirst, urination and weight loss should be investigated before the pet becomes dehydrated or ketotic.

Using the wrong syringe

U-40 and U-100 insulin syringes are not interchangeable.

Giving a second dose after a fur shot

Some insulin may already have entered the skin.

Doubling the next dose after one is missed

This can cause severe hypoglycaemia.

Increasing insulin after one high reading

One high result may reflect stress, food, timing, a missed injection or an earlier low glucose episode.

Changing food without glucose monitoring

A major carbohydrate reduction can quickly reduce insulin requirements in a cat.

Assuming oral medication is automatically safer

SGLT2 inhibitors can cause fatal DKA or euglycaemic DKA in an unsuitable patient.

Ignoring reduced appetite

An uncomplicated diabetic animal is often hungry. Appetite loss may indicate pancreatitis, infection, DKA, kidney disease or another significant problem.

Stopping insulin because the pet looks better

A cat may be moving towards remission, but treatment should only be withdrawn after monitoring confirms it is safe. A dog generally still requires insulin even when the clinical signs improve.

Focusing only on glucose

Appetite, thirst, urination, body weight, muscle condition and quality of life are equally important measures of control.

Can Diabetes Be Prevented?

Not every case can be prevented, particularly when pancreatic beta-cell loss, genetic susceptibility or pancreatitis is involved.

Risk may be reduced by:

• Maintaining a healthy body condition

• Providing regular physical activity

• Preventing severe obesity

• Investigating unexplained weight loss or thirst promptly

• Using glucocorticoids and progestogens only when medically necessary

• Monitoring pets receiving long-term steroid medication

• Treating dental and inflammatory disease

• Managing pancreatitis and hormonal disease

• Spaying female dogs not intended for breeding

• Including blood and urine testing in appropriate senior health checks

Weight control is especially important in cats because obesity is a major contributor to insulin resistance. Prevention becomes much more difficult once prolonged hyperglycaemia has damaged pancreatic beta-cell function.

Can a Cat Go Into Diabetic Remission?

Yes.

Diabetic remission means a cat maintains normal glucose for more than four weeks without insulin or an oral glucose-lowering drug.

Remission is more likely when:

• Diabetes is diagnosed early

• Hyperglycaemia is controlled promptly

• Obesity is addressed

• Steroid medication can be withdrawn safely

• Dental or inflammatory disease is treated

• Glucose is monitored closely

• Insulin is reduced promptly as requirements fall

Most feline remission occurs during the first several months after diagnosis. However, a cat in remission is not permanently cured. Pancreatic insulin reserve remains limited, and relapse can occur later.

Unrecognised remission is dangerous because continuing the previous insulin dose can cause severe hypoglycaemia.

What Is the Outlook for a Diabetic Dog or Cat?

Many diabetic dogs and cats can maintain a good quality of life for years with consistent treatment.

The strongest outcomes are usually seen when:

• Treatment is started promptly

• Owners are comfortable with medication

• Food intake is predictable

• Body weight is monitored

• Hypoglycaemia is recognised early

• Concurrent diseases are treated

• Dose changes are based on proper monitoring

• The care plan is practical enough to maintain

Regulation may take several weeks or months. This does not mean treatment has failed. Diabetes is less like fixing a light switch and more like negotiating with a thermostat that has opinions.

Frequently Asked Questions

Does diabetes go away in dogs?

Usually not. Naturally occurring canine diabetes generally requires lifelong insulin. Remission is rare, although hormonally driven diabetes in an intact female may improve after spaying.

Does a diabetic cat need insulin forever?

Not always. Some cats enter remission after effective treatment and management of insulin resistance. Others require lifelong insulin. Selected newly diagnosed cats may qualify for an SGLT2 inhibitor instead.

Should I give insulin if my pet does not eat?

Contact your veterinarian before giving the normal full dose. The correct response depends on the insulin, glucose level, ketone status and why the pet is not eating. Vomiting, lethargy or complete appetite loss requires prompt assessment.

Can a diabetic dog or cat still have treats?

Yes, but treats should be measured, counted within the daily calories and given consistently. Cats generally benefit from lower-carbohydrate choices. Treats must also be compatible with kidney, intestinal or other concurrent disease.

Is one high glucose result an emergency?

Not necessarily. One high result may reflect stress, food or test timing. A low glucose result with weakness or neurological signs is more immediately dangerous. High glucose becomes urgent when it is accompanied by vomiting, appetite loss, dehydration, ketones, weakness or abnormal breathing.

Final Takeaway

Diabetes mellitus causes persistent high blood glucose because the body does not produce enough effective insulin.

The classic warning pattern is increased thirst, increased urination, increased appetite and weight loss. Dogs may develop cataracts, while cats may develop hindlimb weakness and a dropped-hock stance.

Most diabetic dogs require lifelong insulin. Cats may receive insulin or, when they meet strict safety criteria, an oral SGLT2 inhibitor. Some cats enter remission, but continued monitoring is essential because an unchanged insulin dose can become dangerous as insulin requirements fall.

The real goal is not a perfect glucose number. It is a comfortable pet that drinks and urinates normally, maintains an appropriate weight, avoids hypoglycaemia and remains free from diabetic emergencies.

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If you are unsure whether your dog or cat’s thirst, appetite change, glucose result, insulin dose or ketone reading is urgent, ASK A VET™ can help you organise the information and understand what to discuss with your veterinarian next.