Senior Horse Care: Feeding, Dental Care, Vaccines and Warning Signs

By Dr Duncan Houston

A horse does not suddenly become frail on the day they turn 15. Some horses remain fit, active and competitive well into their twenties, while others begin needing additional support much earlier.

What matters most is not the number on the horse’s passport. It is whether their weight, muscle mass, chewing ability, mobility, coat, feet, appetite or behaviour are beginning to change.

The mistake owners often make is blaming these changes on old age. Weight loss, stiffness, poor coat shedding and slower eating may be common in senior horses, but old age itself is not a diagnosis.

Quick Answer

Horses are commonly considered senior from around 15 years of age, although their care should be based on health and function rather than age alone.

A senior horse should generally have at least an annual veterinary examination and full dental assessment, monthly body condition monitoring, an individual vaccination plan and evidence-based parasite control. Diet should be adjusted according to the horse’s teeth, body condition, workload and metabolic health, not simply because the bag says “senior”.

Arrange a veterinary examination if your horse develops weight or muscle loss, slower chewing, recurrent foot soreness, stiffness, delayed coat shedding, increased drinking or any unexplained change in behaviour. Sudden colic, choke, acute laminitis, breathing difficulty, collapse or neurological signs require urgent care.

What Age Is a Horse Considered Senior?

Many research studies and veterinary care programmes use 15 years of age as the beginning of the senior category. However, this is a practical monitoring threshold rather than a biological switch.

A 16-year-old competition horse with excellent teeth, normal body condition and no medical problems may need very few changes. A 15-year-old horse with arthritis, dental disease or pituitary pars intermedia dysfunction may already require significant support.

A large US study involving 2,717 owner-reported senior horses defined seniors as horses aged 15 or older. The most frequently reported veterinary-diagnosed conditions were osteoarthritis, dental disease, lameness and PPID. Retired horses were also more likely to receive lower levels of routine health care, despite still being vulnerable to disease. (PubMed)

Treat 15 as the age to start watching more closely, not the age to assume decline is inevitable.

What Changes as a Horse Gets Older?

Not every senior horse develops the same problems, but ageing can affect several body systems.

Dental reserve decreases

Horses have a finite amount of tooth available beneath the gumline. As the teeth wear and erupt throughout life, older horses can eventually lose effective grinding surface.

Missing teeth, worn teeth, gaps between teeth, periodontal disease, fractures and infections can reduce the horse’s ability to chew hay properly.

Muscle becomes harder to maintain

Senior horses may lose muscle across the topline, hindquarters and neck even when their overall body weight appears reasonable.

This can result from:

• Reduced exercise

• Arthritis or chronic pain

• Inadequate protein or energy intake

• Dental disease

• PPID

• Chronic systemic disease

Fat can sometimes hide muscle loss, particularly in horses with endocrine disease. This is why body condition and muscle condition should be assessed separately.

Joint disease becomes more common

Osteoarthritis was the most commonly reported veterinary-diagnosed condition in a recent study of senior horses. It can affect movement, hoof handling, access to feed, willingness to lie down and the horse’s ability to rise comfortably. (University of Kentucky)

Endocrine disease becomes more likely

PPID becomes increasingly common with age. Research estimates that approximately 20 to 25 percent of horses aged 15 or older may be affected, although prevalence varies between populations and diagnostic methods. (PMC)

Immune function can change

Age-related immune changes, sometimes called immunosenescence, may alter how older horses respond to infection and vaccination. This does not mean vaccines stop working or should be discontinued. It means the horse’s health, exposure risk and vaccination programme should be reviewed rather than assumed. (PMC)

A Practical Senior Horse Monitoring Schedule

Frequency	What to monitor
Daily	Appetite, chewing, water intake, manure, urination, movement and general attitude
Weekly	Feet, digital pulses, wounds, swelling, coat, rugs and access to feed
Monthly	Weight tape, body condition score, muscle condition and comparison photographs
Every 6 to 12 months	Veterinary examination, depending on health and existing disease
At least annually	Full dental examination, with more frequent checks when disease is present
Once or twice yearly	Faecal egg counts as part of an individual parasite plan
As scheduled by your veterinarian	Vaccination, blood testing, endocrine monitoring and medication review

Mature horses should receive a thorough dental examination at least once a year. The AAEP also recommends using faecal egg counts to classify shedding patterns and guide parasite treatment rather than relying on fixed year-round deworming intervals.

How Should You Monitor a Senior Horse’s Weight?

Do not rely on memory or casual observation. Changes are easy to miss when you see the horse every day.

Record:

• Body weight or weight-tape measurement

• Body condition score

• Topline and hindquarter muscle

• Neck and crest fat

• Rib coverage

• Appetite and eating speed

• Feed left behind after meals

• Photographs from both sides and behind

Use the same weight tape, positioning and approximate time of day each month.

A rug can hide major weight loss. Remove rugs regularly and run your hands over the ribs, spine, shoulders, hips and topline.

Any unexplained downward weight trend deserves investigation before the horse becomes visibly thin.

Does Every Older Horse Need Senior Feed?

No.

The word “senior” on a feed bag does not automatically mean it is the correct diet for every older horse. Some senior horses become underweight, while others are overweight and insulin dysregulated. Those horses need very different feeding plans.

Feed according to:

• Body condition

• Muscle condition

• Dental function

• Workload

• Forage quality

• Metabolic status

• Medical history

• Ability to compete for feed

If your horse maintains weight and chews normally

A healthy senior horse with good teeth may continue doing well on an appropriate forage-based diet with balanced vitamins, minerals, protein and salt.

There is no reason to change a successful diet solely because the horse has reached a particular birthday.

If your horse is losing weight

Do not simply add more grain and hope for the best.

Weight loss can be associated with:

• Dental disease

• Inadequate feed intake

• Poor-quality forage

• PPID

• Parasites

• Arthritis or other chronic pain

• Gastric or intestinal disease

• Liver or kidney disease

• Chronic infection

• Cancer

• Social competition at the feeder

A veterinary and dental assessment should come before major calorie increases. Weight loss in an older horse should be investigated rather than dismissed as normal ageing. (PubMed)

Once underlying disease has been addressed, calories can often be increased using digestible fibre and fat rather than simply feeding larger grain meals.

If your horse can no longer chew hay effectively

A complete senior feed may be used as a partial or total forage replacement when it is specifically labelled for that purpose.

Other options may include:

• Soaked hay pellets

• Fully soaked hay cubes

• Beet pulp prepared according to the product instructions

• Chopped forage, when the horse can chew it safely

• A complete soaked mash

• Multiple smaller meals throughout the day

The total dry weight of feed matters. A large bucket of wet mash may contain much less actual feed than it appears to.

Complete feeds must also be given at the manufacturer’s recommended rate to provide the intended fibre, protein, vitamins and minerals. A token scoop may not create a balanced diet.

Horses with poor teeth or previous choke should not be given dry pellets, cubes or rapidly expanding feeds without veterinary and nutritional guidance. Choke can cause feed material and saliva to come from the nostrils and requires prompt veterinary attention. (AAEP)

If your senior horse is overweight

Do not automatically move to a calorie-dense senior ration.

An overweight horse, particularly one with a cresty neck, regional fat deposits or previous laminitis, may need:

• Controlled forage intake

• Forage analysis

• Lower non-structural carbohydrate feed

• Restricted or managed pasture access

• Slow feeders

• Gradual weight loss

• Testing for insulin dysregulation

Severe feed restriction can also be dangerous, especially in ponies and other metabolically efficient horses. Weight loss should be controlled rather than crash-dieted.

If your horse is losing muscle

Adding calories alone may not correct muscle wasting.

The horse may need:

• Adequate high-quality protein

• Appropriate amino acid balance

• Controlled exercise

• Better pain management

• Dental treatment

• Testing for PPID or other disease

Nutrition reviews for older horses should consider energy, protein quality, dental function, forage intake and underlying disease together. (Beva)

How Often Do Senior Horses Need Dental Care?

Every senior horse should receive at least an annual full-mouth dental examination. Horses with known dental disease, reduced chewing ability, previous extractions or substantial tooth loss may need examinations every six months or occasionally more often.

A proper examination usually requires:

• Appropriate restraint and often sedation

• A full-mouth speculum

• Adequate lighting

• Examination of every accessible tooth

• Assessment of the gums and periodontal spaces

• Dental charting

• Imaging when infection, fracture or root disease is suspected

Simply lifting the lip or pulling the tongue aside does not adequately examine the cheek teeth.

Warning signs of dental disease

Watch for:

• Dropping partially chewed feed

• Balls of chewed hay around the feeder

• Taking longer to finish meals

• Chewing on one side

• Excessive salivation

• Long hay fibres or whole grains in the manure

• Bad breath

• Blood in the mouth

• Facial or jaw swelling

• Unilateral nasal discharge

• Recurrent choke

• Weight loss

• New resistance to the bit

Some horses continue eating despite severe dental disease. The absence of obvious signs does not guarantee a healthy mouth.

Dental care is more than floating

Floating is one possible treatment after the mouth has been examined. It is not the examination itself.

Older horses may develop periodontal pockets, gaps between teeth, worn or loose teeth, pulp disease, fractures and infections. These problems cannot be fixed by simply rasping the teeth more aggressively.

In senior horses, the objective is often to preserve the remaining functional tooth, control pain and adapt the diet around what can no longer be corrected. (avmajournals.avma.org)

Do Senior Horses Still Need Vaccinations?

Yes. Retirement does not remove the risk of tetanus, mosquito-borne disease or exposure to infections carried by other horses.

The vaccination programme should be based on:

• Geographic location

• Local disease prevalence

• Travel

• Contact with visiting horses

• Barn movement

• Competition requirements

• Previous vaccination history

• Overall health

• Product instructions

• Local law

In North America, the AAEP classifies tetanus, Eastern and Western equine encephalomyelitis, West Nile virus and rabies as core vaccines. Influenza, equine herpesvirus, strangles and several other vaccines are risk-based. Recommendations differ between countries, so the local veterinarian should set the programme. (AAEP)

Do older horses respond normally to vaccines?

Ageing can alter immune responses, but older horses can still respond to vaccination and should not be assumed to be unprotected or incapable of mounting immunity.

The practical response is to maintain an appropriate programme, support general health and minimise unnecessary infectious exposure.

Should antibody titres replace vaccination?

Not routinely.

Antibody titres can be useful in selected circumstances, particularly when a horse has experienced a previous adverse vaccination event. However, circulating antibodies represent only one part of immunity, and the relationship between titre level and clinical protection has not been established for every equine vaccine. (AAEP)

What about contact with travelling horses?

There is no need to socially isolate an elderly horse simply because of age. Social contact remains important for welfare.

Instead:

• Quarantine new arrivals

• Avoid shared equipment during outbreaks

• Monitor horses returning from travel

• Follow local biosecurity guidance

• Keep vaccination records current

• Separate any horse showing fever or respiratory signs

A retired horse can still be exposed through a younger field mate that travels.

How Should Senior Horses Be Dewormed?

Routine treatment every few weeks and blind rotation between dewormer classes are no longer considered good parasite control.

Current AAEP guidance recommends:

• Faecal egg counts once or twice yearly to identify low, moderate and high shedders

• Faecal egg count reduction testing to confirm that the chosen treatment works on that property

• Baseline treatment once or twice yearly for adult horses

• Additional targeted treatment for higher shedders

• Avoiding fixed, frequent year-round treatment without testing

No dewormer removes every parasite stage, and a faecal egg count does not detect every important parasite or prove that parasites are causing disease. (AAEP)

Age alone does not automatically mean a horse needs more deworming. However, horses with PPID or unexplained weight loss may need closer monitoring because endocrine and immune changes can alter egg shedding and the period before eggs reappear after treatment. (PubMed)

Environmental management remains important:

• Remove manure regularly

• Avoid excessive stocking density

• Prevent feed contamination

• Rotate or rest paddocks where practical

• Avoid feeding directly beside manure

• Do not share pasture blindly without a herd parasite plan

What Is PPID in Senior Horses?

Pituitary pars intermedia dysfunction, or PPID, is the condition historically called equine Cushing’s disease.

It is an age-associated endocrine disorder involving abnormal activity within the pituitary gland. PPID becomes increasingly common in horses and ponies over 15, but it can occur earlier.

Signs of PPID

Possible signs include:

• Delayed or incomplete coat shedding

• A long or curly coat

• Loss of topline muscle

• A pot-bellied appearance

• Abnormal sweating

• Lethargy

• Increased drinking and urination

• Recurrent infections

• Slow wound healing

• Recurrent hoof abscesses

• Laminitis

• Infertility

• Reduced performance

Do not wait for the classic long, curly coat. Horses with early PPID may have subtle muscle loss, delayed shedding, reduced performance or laminitis while otherwise appearing relatively normal.

How is PPID tested?

Testing may involve:

• Resting plasma ACTH

• A TRH stimulation test

• Testing for concurrent insulin dysregulation

• Supporting blood and urine testing when indicated

ACTH changes naturally throughout the year, so results must be interpreted using appropriate seasonal reference ranges. A resting ACTH test may identify moderate or advanced disease, while a TRH stimulation test may be more useful when early PPID is suspected or initial results are inconclusive. (PMC)

Because PPID and insulin dysregulation often occur together, insulin testing should also be considered. This is particularly important in horses with laminitis, regional fat deposits or a cresty neck.

Are PPID and Equine Metabolic Syndrome the Same?

No.

PPID

PPID is primarily an age-associated pituitary disorder. Horses may be lean, overweight or normal in body condition.

Equine metabolic syndrome

Equine metabolic syndrome is characterised primarily by insulin dysregulation and increased risk of hyperinsulinaemia-associated laminitis. Affected horses are often easy keepers and may have generalised obesity or regional fat deposits, but not every affected horse is visibly obese.

EMS can develop before a horse reaches senior age. Older horses can have PPID, EMS or both conditions simultaneously. (PMC)

This distinction matters nutritionally.

A lean PPID horse with normal insulin regulation may need additional calories, protein and fat. A PPID horse with insulin dysregulation may require strict control of dietary sugar and starch.

Do not assume every horse with PPID needs weight loss or severe carbohydrate restriction. Feed selection should be based on body condition and confirmed insulin status. (Squarespace)

How Should Arthritis and Mobility Be Managed?

Slowing down is not always harmless ageing.

Watch for:

• Shortened stride

• Stiffness after rest

• Difficulty turning

• Reluctance to lie down

• Difficulty getting up

• Trouble lifting feet for the farrier

• Reduced willingness to walk to feed or water

• Irritability during grooming or saddling

• Loss of hindquarter muscle

• Repeated stumbling

A horse does not need to be obviously lame to have significant musculoskeletal discomfort.

Should an older horse still exercise?

Many senior horses benefit from regular, controlled movement when they are comfortable enough to do it.

Appropriate activity can help preserve:

• Muscle mass

• Joint mobility

• Balance

• Cardiovascular fitness

• Mental engagement

• Normal gut movement

The exercise plan may involve turnout, walking, gentle ridden work or groundwork. It should be adjusted to the horse’s soundness rather than stopped automatically because of age.

A survey of senior horses found that low muscle mass and retirement were important concerns, reinforcing the value of monitoring exercise and muscle condition rather than assuming complete inactivity is kinder. (PubMed)

Pain relief, hoof balance, footing, warm-up time and workload may all need adjustment. Any horse receiving long-term anti-inflammatory medication should be monitored by a veterinarian.

How Worried Should You Be?

Low Risk

The horse:

• Maintains weight and muscle

• Chews comfortably

• Produces normal manure

• Moves comfortably

• Sheds the coat normally

• Has no recent laminitis, choke or colic

• Remains socially engaged

What to do: Continue monthly monitoring and routine preventive care.

Moderate Risk

The horse develops:

• Gradual weight or topline loss

• Slower eating

• Occasional quidding

• Increasing stiffness

• Delayed coat shedding

• Mildly increased thirst

• Reduced performance

• Difficulty competing for feed

What to do: Arrange a veterinary examination within the next one to two weeks. Do not wait for the next annual visit if the change is continuing.

High Risk

The horse has:

• Rapid or substantial weight loss

• Recurrent choke or colic

• Significant dental pain

• Facial swelling or unilateral nasal discharge

• Marked lameness

• New hoof pain

• Persistent fever

• Recurrent infections

• Difficulty rising

• Reduced appetite lasting more than several hours

What to do: Contact your veterinarian the same day.

Critical

The horse shows:

• Severe or persistent colic

• Feed or saliva pouring from the nostrils

• Acute laminitis

• Breathing difficulty

• Collapse

• Inability to rise

• Neurological signs

• Non-weight-bearing lameness

• Severe bleeding

• Rapid deterioration

What to do: Treat this as an emergency and contact an equine veterinarian immediately.

When Is This an Emergency?

Seek urgent veterinary care if your senior horse develops:

• Repeated rolling, violent pawing or persistent abdominal pain

• Feed material or saliva coming from the nostrils

• Repeated coughing, retching or inability to swallow

• A rocked-back stance or sudden reluctance to turn

• Hot feet with strong or bounding digital pulses

• Severe breathing effort

• Collapse or inability to stand

• Sudden incoordination, circling, head pressing or seizures

• Non-weight-bearing lameness

• Major wounds or uncontrolled bleeding

• Fever with marked depression

• Sudden blindness or a painful, closed eye

For suspected choke, remove access to food and water while waiting for the veterinarian. Do not give oral medication, oil, water or feed by syringe, and never attempt to flush the obstruction with a garden hose. (AAEP)

What Should You Do Next?

1. Establish a senior health baseline

Book a veterinary examination before major problems become obvious.

Record:

• Weight and body condition

• Muscle condition

• Heart and respiratory findings

• Mobility

• Hoof comfort

• Dental status

• Existing lumps or skin lesions

• Vision

• Current medications and supplements

Blood and urine testing may be useful when there is weight loss, increased drinking, chronic medication use, recurrent infection or another clinical concern.

2. Start monthly weight and muscle tracking

Use a weight tape and photographs. Record topline, hindquarter and neck muscle separately from body fat.

3. Arrange a proper dental examination

Do not wait for the horse to stop eating. Once an older horse has lost substantial dental function, it cannot be restored with floating.

4. Review the entire ration

Weigh the feed rather than relying on scoops. Assess forage quality, total dry matter, protein, salt, minerals and access to water.

5. Review vaccinations and parasite control

Build the plan around local disease risk, travel exposure, faecal testing and evidence of dewormer effectiveness.

6. Consider endocrine testing

Discuss PPID and insulin testing if the horse has muscle loss, delayed shedding, laminitis, abnormal fat deposits, increased drinking, recurrent infections or reduced performance.

7. Assess mobility and pain

Look at the horse walking, turning, backing, lifting each foot and getting up after lying down. Subtle deterioration often appears during these tasks before obvious lameness develops.

Common Senior Horse Care Mistakes

Assuming weight loss is normal

Aging may change nutritional needs, but unexplained weight loss still requires investigation.

Feeding senior feed purely because of age

The horse may not need extra calories, or the selected feed may be inappropriate for insulin dysregulation.

Waiting for obvious dental signs

Many horses adapt to oral pain and continue eating despite substantial disease.

Giving too little complete feed

A small scoop may provide additional calories without supplying enough fibre, vitamins or minerals to create a balanced ration.

Deworming blindly

Frequent treatment without faecal testing or resistance monitoring wastes medication and contributes to resistance.

Stopping vaccination because the horse is retired

Retired horses remain vulnerable to tetanus, mosquito-borne disease and infection introduced by travelling herdmates.

Removing all exercise

Complete inactivity can accelerate muscle loss and stiffness. Movement should be adapted to comfort, not automatically eliminated.

Leaving rugs on continuously

Rugs can hide weight loss, skin disease, wounds and pressure sores. Remove them regularly and examine the horse properly.

How Can You Help a Senior Horse Stay Healthy?

Keep the care plan simple and consistent:

• Provide reliable access to clean water

• Feed separately if herd competition is present

• Maintain social contact

• Provide shelter from heat, cold, wind and rain

• Use safe, non-slip footing

• Keep feed and water within comfortable walking distance

• Maintain regular farrier care

• Continue appropriate movement

• Treat chronic pain

• Review long-term medications

• Monitor body condition every month

• Investigate small changes early

Quality of life is not measured by age alone.

A senior horse with controlled disease, a good appetite, comfortable movement, social interest and stable body condition may continue enjoying an excellent life for many years.

Frequently Asked Questions

At what age should a horse start senior health checks?

Around 15 years is a sensible point to establish closer monitoring, even when the horse appears healthy. The frequency of examinations should increase when weight, dental function, mobility or endocrine health begins to change.

How often should a senior horse see a veterinarian?

A stable senior should generally receive at least an annual examination. Horses with PPID, dental disease, chronic lameness, weight loss or long-term medication may need reviews every six months or more frequently.

Does every senior horse need senior feed?

No. Horses maintaining normal weight and chewing forage effectively may not need a senior ration. Diet changes should be based on dental function, body condition, workload and metabolic status.

How often should an older horse have dental examinations?

At least once a year. Horses with missing teeth, periodontal disease, quidding, weight loss or previous dental surgery often need six-monthly examinations.

Should every senior horse be tested for PPID?

Age alone does not confirm PPID, but testing should be discussed for horses in their teens and beyond when there is delayed shedding, muscle loss, laminitis, increased drinking, recurrent infection or another suspicious change. Early disease may be subtle.

The Real Takeaway

Good senior horse care is not about changing everything when the horse turns 15.

It is about noticing trends earlier.

Monitor weight and muscle. Protect dental function. Feed according to the horse in front of you. Keep vaccinations and parasite control evidence-based. Watch for PPID, insulin dysregulation, arthritis and laminitis. Most importantly, never dismiss a new clinical change as “just old age” without considering what may be causing it.

The earlier a problem is recognised, the more options there usually are to preserve comfort, function and quality of life.

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Unsure whether your senior horse’s weight loss, coat changes, stiffness or eating difficulties are part of normal ageing or a sign of disease? ASK A VET™ can help you organise the history, review ongoing trends and decide how urgently an in-person equine veterinary examination is needed.