Senior Dog Behaviour Changes: Signs of Pain, Anxiety and Canine Cognitive Dysfunction

By Dr Duncan Houston.

Older dogs often become quieter, sleep longer or move more slowly. However, sudden or progressive behavioural changes should not automatically be dismissed as normal ageing.

House-soiling, confusion, night-time pacing, irritability and reduced social interaction may be caused by pain, sensory loss, internal disease, neurological disease or canine cognitive dysfunction syndrome.

Identifying the cause early gives your dog the best opportunity for treatment, greater comfort and a better quality of life.

Quick Answer

Contact your veterinarian if your senior dog develops:

Confusion or disorientation
Night-time restlessness
House-soiling
New anxiety or clinginess
Irritability, growling or aggression
Reduced interaction
Changes in appetite or thirst
Difficulty walking or settling
Loss of previously learned behaviours

Canine cognitive dysfunction is one possible cause, but it is a diagnosis made after other medical problems have been considered.

Some causes of behavioural change are treatable, so never assume your dog is “just getting old”.

When Is a Dog Considered Senior?

There is no single age at which every dog becomes senior.

Ageing depends on:

Breed
Adult body size
Genetics
Health history
Lifestyle
Previous injuries
Nutrition

Large and giant breeds generally enter their senior years earlier than smaller dogs. A practical veterinary definition considers a pet senior when they enter approximately the final quarter of their expected lifespan.

Rather than waiting for obvious decline, begin monitoring changes before your dog appears elderly. New canine cognitive dysfunction guidelines recommend establishing a behavioural baseline from approximately seven years of age and repeating screening every six to twelve months. Read the canine cognitive dysfunction guidelines.

Common Behaviour Changes in Senior Dogs

Ageing dogs may develop changes involving:

Sleep
Toileting
Social interaction
Learning and memory
Activity
Anxiety
Appetite
Mobility
Vocalisation
Responses to familiar people or places

Examples include:

Pacing at night
Sleeping more during the day
Staring at walls
Becoming trapped behind furniture
Not responding to familiar cues
Urinating or defecating indoors
Following family members constantly
Becoming unusually withdrawn
Barking or whining without an obvious trigger
Appearing startled when approached
Losing interest in walks or play
Becoming irritable when touched
Struggling to find food, water or doors

These changes may develop gradually, making them easy to overlook.

Behavioural Changes Are Not Always Dementia

Canine cognitive dysfunction is common in older dogs, but many other conditions can produce similar signs.

Important possibilities include:

Arthritis or spinal pain
Dental disease
Ear infections
Reduced vision
Hearing loss
Kidney disease
Diabetes mellitus
Cushing’s disease
Liver disease
Urinary tract disease
Gastrointestinal illness
Cancer
Neurological disease
Seizure disorders
Brain tumours
Medication side effects
Anxiety
Changes within the household

Several conditions may occur at the same time. For example, a dog with cognitive decline may also have arthritis, hearing loss and increased urinary urgency.

Pain Is a Commonly Missed Cause

Dogs do not always cry or limp when they are painful.

Pain may instead appear as:

Irritability
Growling when touched
Reduced interaction
Reluctance to walk
Difficulty settling
Night-time restlessness
Panting when not hot
Reduced appetite
House-soiling
Refusal to climb stairs
Slower responses to cues
Avoidance of grooming
Aggression when approached in bed

A dog that suddenly “doesn’t want to be bothered” may be protecting a painful part of their body.

Never punish a senior dog for growling. Stop the interaction and arrange a veterinary assessment.

Vision and Hearing Loss

Sensory decline can change how a dog responds to the world.

A dog with hearing loss may:

Stop responding to their name
Sleep through your arrival
Startle when touched
Bark more loudly
Appear to ignore cues

A dog with reduced vision may:

Hesitate in dark rooms
Bump into furniture
Struggle on stairs
Become anxious in unfamiliar environments
React defensively when approached suddenly
Avoid going outside at night

Approach slowly, avoid startling the dog and use predictable visual, verbal or vibration-based signals.

Sudden blindness, unequal pupils, red eyes or eye pain require prompt veterinary attention.

What Is Canine Cognitive Dysfunction Syndrome?

Canine cognitive dysfunction syndrome, or CCDS, is an age-associated neurobehavioural condition involving progressive changes in memory, learning, awareness and behaviour.

It is sometimes called “dog dementia”. Although it shares certain clinical and pathological features with Alzheimer’s disease, it is not identical to human Alzheimer’s disease.

CCDS most commonly affects older dogs and becomes increasingly common with advancing age. It remains underdiagnosed because many families assume the early changes are an unavoidable part of ageing.

The DISHAA Signs of Canine Cognitive Dysfunction

Veterinarians commonly organise signs using the acronym DISHAA.

D: Disorientation

Signs may include:

Becoming lost in familiar rooms
Staring at walls or into space
Going to the wrong side of a door
Becoming trapped behind furniture
Failing to recognise familiar routes
Appearing confused after waking

I: Changes in Social Interactions

A dog may:

Seek more attention
Become unusually clingy
Withdraw from family members
Stop greeting familiar people
Become irritable
Avoid handling
React differently to other pets

S: Sleep-Wake Cycle Changes

Watch for:

Sleeping more during the day
Pacing at night
Waking and vocalising
Wandering through the house
Difficulty settling
Repeatedly waking the household

H: House-Soiling, Learning and Memory Changes

Possible signs include:

Urinating or defecating indoors
Forgetting how to ask to go outside
Toileting shortly after returning indoors
Forgetting familiar cues
Appearing unable to complete known routines
Reduced response to previous training

House-soiling can also result from urinary disease, diarrhoea, diabetes, kidney disease, incontinence or difficulty reaching the door.

A: Activity Changes

Activity may increase or decrease.

Changes include:

Reduced interest in play
Repetitive walking
Aimless wandering
Restlessness
Repetitive licking
Difficulty initiating familiar activities
Reduced exploration

A: Anxiety

New fears may involve:

Being left alone
Darkness
Unfamiliar places
Loud sounds
People or other animals
Being touched
Changes in routine

Some dogs become increasingly dependent on one family member.

Is Canine Cognitive Dysfunction an Emergency?

CCDS usually develops gradually and is not itself an immediate emergency.

However, sudden or severe neurological changes should not be assumed to be dementia.

Seek urgent veterinary care if your senior dog develops:

A seizure
Collapse
Sudden inability to stand
Severe weakness
Rapid circling
Head pressing
Sudden blindness
Loss of balance
Repeated vomiting
Difficulty breathing
Severe pain
A dramatically altered level of awareness
Suspected toxin exposure

Sudden confusion can be caused by serious metabolic, cardiovascular or neurological disease.

How Veterinarians Diagnose Behaviour Changes

There is no single blood test that confirms canine cognitive dysfunction.

Diagnosis involves:

Documenting the behavioural changes
Assessing their severity and progression
Looking for physical or neurological abnormalities
Investigating medical conditions that could explain the signs
Monitoring the dog over time

Your veterinarian may recommend:

A complete physical examination
Orthopaedic assessment
Neurological examination
Dental and oral examination
Eye and ear assessment
Blood pressure measurement
Complete blood count
Biochemistry testing
Urinalysis
Thyroid testing when indicated
Diagnostic imaging
A pain-management trial
Advanced imaging or specialist referral

Brain imaging, such as MRI, may be recommended when signs are unusual, rapidly progressive or suggest a structural brain disorder.

Behavioural Questionnaires

Structured questionnaires can help identify subtle changes and monitor progression.

Commonly used tools include:

DISHAA questionnaires
Canine Cognitive Dysfunction Rating Scale
Canine Dementia Scale

A questionnaire does not replace veterinary assessment, but it can provide a useful baseline.

Keep notes on:

Sleep patterns
Accidents
Pacing
Appetite
Anxiety
Mobility
Social interaction
Response to cues
Good and bad days

Videos of unusual behaviour can also be extremely helpful.

Treatment Goals

There is currently no guaranteed cure for canine cognitive dysfunction.

Treatment aims to:

Address pain and other medical conditions
Reduce anxiety
Improve sleep
Support cognitive function
Maintain independence
Improve safety
Preserve enjoyable activities
Protect quality of life
Support the people caring for the dog

The most effective plan is usually multimodal, combining medical treatment, environmental changes, nutrition and appropriate enrichment.

Step 1: Treat Medical Problems and Pain

Treatable conditions should be addressed first.

Depending on the diagnosis, veterinary treatment may involve:

Pain relief
Arthritis management
Dental treatment
Treatment for urinary or gastrointestinal disease
Management of endocrine disease
Vision or eye treatment
Anxiety medication
Sleep support
Physiotherapy or rehabilitation

Medication must be selected for the individual dog. Senior dogs commonly have multiple health conditions, so products that are safe for one dog may be unsuitable for another.

Never give human pain medication unless specifically instructed by a veterinarian.

Step 2: Discuss Cognitive Medication

Selegiline is approved for treating canine cognitive dysfunction in some countries and may improve signs in certain dogs.

Other medications may be prescribed to address:

Anxiety
Night-time restlessness
Pain
Sleep disruption
Panic
Compulsive behaviour

Medication response varies. Your veterinarian must consider existing medications because selegiline can interact dangerously with certain antidepressants, pain medications and other drugs.

Do not combine behavioural medications or supplements without veterinary advice.

Step 3: Consider a Cognitive-Support Diet

Some veterinary diets contain combinations of:

Medium-chain triglycerides
Antioxidants
Omega-3 fatty acids
Vitamins
Amino acids
Mitochondrial cofactors

Research suggests that certain dietary strategies may support cognitive function, particularly when combined with environmental enrichment.

Diet changes should be discussed with your veterinarian, especially if your dog also has kidney, liver, pancreatic, gastrointestinal or endocrine disease.

Step 4: Be Careful With Supplements

Supplements marketed for senior brain health may contain:

SAMe
Omega-3 fatty acids
Phosphatidylserine
Antioxidants
Herbal ingredients
Medium-chain triglycerides

Evidence varies considerably between products, and quality control is not equal across brands. Supplements may also interact with medications or be inappropriate for dogs with particular diseases.

Veterinary guidelines note that the supporting research for many nutraceuticals remains limited. Review the AAHA senior-care guidance.

Use supplements as part of a veterinary plan, not as a substitute for diagnosis.

Step 5: Make the Home Easier to Navigate

Simple environmental changes can reduce confusion and protect independence.

Consider:

Non-slip rugs and runners
Ramps instead of stairs
Baby gates around hazardous areas
Night-lights
Easily accessible water bowls
Supportive bedding
Lower-entry beds
Predictable furniture placement
Clear walking paths
More frequent toilet access
Indoor toileting options when necessary
Raised or stable feeding stations where appropriate

Avoid frequently rearranging furniture. Familiar landmarks help dogs navigate.

Step 6: Create a Predictable Routine

Consistency can reduce anxiety and confusion.

Keep regular times for:

Meals
Medication
Walks
Toileting
Sleep
Enrichment
Family interaction

Use simple cues and guide your dog gently through familiar routines.

If a major change is unavoidable, introduce it gradually wherever possible.

Step 7: Support Better Sleep

Night-time restlessness can be exhausting for dogs and caregivers.

Helpful strategies may include:

Gentle daytime activity
Regular toilet breaks
A comfortable sleeping area
Night-lights
White noise
A predictable evening routine
Reduced late-night stimulation
Veterinary treatment for pain or anxiety

A dog pacing at night should be assessed for pain, urinary urgency, gastrointestinal discomfort and other medical causes before the behaviour is attributed to dementia.

Step 8: Provide Gentle Mental Enrichment

Senior dogs can continue learning and enjoying new experiences.

Appropriate activities include:

Sniffing games
Easy food puzzles
Short reward-based training sessions
Slow exploratory walks
Finding treats hidden in accessible locations
Familiar toys
Simple nose-target exercises
Calm social interaction

Keep activities achievable. A puzzle that is too difficult may create frustration instead of enrichment.

Learning new skills does not need to be complicated. A gentle nose touch, choosing between toys or finding a treat under one of two cups can provide useful mental engagement.

Step 9: Maintain Safe Physical Activity

Regular, comfortable movement supports:

Mobility
Muscle strength
Sleep
Digestion
Confidence
Mental stimulation
Social connection

Exercise should be adjusted to the dog’s health and stamina.

Several short walks may be better than one long walk. Allow plenty of time for sniffing and avoid slippery surfaces, extreme temperatures and exhausting activity.

Ask your veterinarian whether physiotherapy, hydrotherapy or a tailored exercise plan would be appropriate.

Step 10: Use Positive Reinforcement

Older dogs can still learn.

Use:

Clear, familiar cues
Small food rewards
Gentle praise
Short sessions
Predictable routines
Hand signals for dogs with hearing loss
Verbal or scent cues for dogs with reduced vision

Do not punish confusion, accidents or slow responses. Your dog may not understand what is expected or may be physically unable to comply.

Managing House-Soiling

If a previously housetrained senior dog begins having accidents:

Arrange a veterinary examination.
Increase toilet opportunities.
Provide easy access to the toilet area.
Use non-slip flooring along the route.
Reward outdoor toileting.
Clean accidents with an enzymatic cleaner.
Consider an indoor toilet area when mobility is limited.
Never punish the dog.

Keep a toilet diary noting the time, location, urine or faeces, meal timing and surrounding events.

Helping a Dog With Hearing or Vision Loss

For Hearing Loss

Use consistent hand signals
Approach where the dog can see you
Create gentle floor vibrations before touching
Avoid waking the dog suddenly
Secure outdoor areas carefully

For Vision Loss

Keep furniture in familiar locations
Block stairways
Use textured mats as landmarks
Speak before touching
Keep bowls and beds in consistent places
Use scent and sound cues
Provide lighting for dogs with partial vision

Sensory loss does not automatically mean poor quality of life. Many dogs adapt very well with appropriate support.

Common Mistakes to Avoid

Assuming Every Change Is Normal Ageing

Ageing increases disease risk, but it does not make persistent pain, confusion or anxiety normal.

Punishing Accidents or Confusion

Punishment increases fear and cannot restore lost memory or physical control.

Changing Everything at Once

Major changes can overwhelm a cognitively impaired dog. Introduce adjustments gradually and preserve familiar routines.

Using Too Much Enrichment

Constant novelty may be stressful. Enrichment should be enjoyable, achievable and balanced with adequate rest.

Starting Multiple Supplements Together

This makes benefits and side effects difficult to identify and increases the risk of interactions.

Waiting Until Signs Are Severe

Early screening creates a baseline and allows medical conditions to be recognised sooner.

Monitoring Quality of Life

Track whether your dog can still:

Eat and drink comfortably
Rest and sleep
Toilet with dignity
Move without significant distress
Enjoy interaction
Engage with their environment
Experience more good days than difficult ones

Quality of life is not based on one symptom alone. Consider comfort, happiness, mobility, hygiene, appetite and meaningful engagement together.

Ask your veterinarian about using a structured quality-of-life scale if decisions are becoming difficult.

Frequently Asked Questions

Is confusion a normal part of ageing?

Occasional slowing may occur, but repeated disorientation, getting trapped, staring at walls or forgetting familiar routines should be investigated.

What age does canine cognitive dysfunction begin?

It is most commonly recognised in older dogs, often from approximately nine years onwards. Current guidance recommends establishing a behavioural baseline from around seven years of age because subtle changes may begin earlier.

Can canine cognitive dysfunction be cured?

There is currently no guaranteed cure, but medication, nutrition, pain management, environmental changes and enrichment may improve symptoms and quality of life.

Does pacing at night mean my dog has dementia?

Not necessarily. Pain, anxiety, urinary urgency, gastrointestinal discomfort, sensory loss and neurological disease can also cause night-time pacing.

Can senior dogs still learn?

Yes. Keep sessions short, rewarding and appropriate for the dog’s physical and cognitive abilities.

Should I give my dog a brain supplement?

Speak with your veterinarian first. Evidence varies, products differ and supplements may interact with medications.

Why has my older dog suddenly become aggressive?

Pain, sensory loss, fear, neurological disease and cognitive decline are possible causes. Arrange a veterinary assessment and avoid situations that trigger aggression.

How often should senior dogs visit the veterinarian?

Many senior dogs benefit from examinations at least every six months, although frequency should be adjusted to their health and individual risks.

Final Thoughts from Dr Duncan Houston

Senior dogs deserve more than an assumption that decline is inevitable.

A change in sleep, toileting, interaction or personality may be the earliest sign of pain, illness, sensory loss or cognitive dysfunction. Early investigation can uncover treatable problems and help families adapt before the situation becomes overwhelming.

With appropriate veterinary care, predictable routines, gentle enrichment and a safer home environment, many senior dogs can continue enjoying meaningful, comfortable lives throughout their golden years.

Support Your Senior Dog With ASK A VET™

Not sure whether your dog’s changes are caused by pain, anxiety, illness or cognitive decline? ASK A VET™ can help you review their symptoms, behaviour, medications, home environment and quality of life.

Visit AskAVet.com or download the ASK A VET™ app for personalised veterinary guidance and practical senior-care support tailored to your dog.

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About the author

Dr Duncan Houston

Veterinarian · Founder of ASK A VET

Every ASK A VET article is written and reviewed by qualified veterinarians.

About Dr. Duncan →drduncanthevet

Senior Dog Behaviour Changes: Signs of Pain, Anxiety and Canine Cognitive Dysfunction