Canine cognitive dysfunction, sometimes called dog dementia, is an age-related condition that affects the brain. It does not always begin with dramatic confusion or a dog getting lost in a familiar room.
The first changes may be much quieter. An older dog may sleep more deeply during the day, seem less alert or engaged, then start waking, pacing or struggling to settle at night. Changes in anxiety, house-training or social interaction can also appear early.
I would not dismiss a persistent change in an older dog’s sleep or behaviour as normal ageing. Pain, poor vision or hearing, kidney disease and other medical problems can look similar or occur alongside cognitive decline, so the dog should be assessed as a whole rather than diagnosed from behaviour alone.
What are the early signs of dog dementia?
The earliest signs are often changes in sleep and behaviour.
I commonly hear about:
- sleeping more during the day
- sleeping more deeply than before
- appearing less alert
- becoming slightly less engaged with the family or surroundings
- waking repeatedly during the night
- difficulty settling at night
- pacing, particularly in the evening
- increasing anxiety
- changes in house-training
- becoming disorientated or getting stuck in familiar places
Veterinary guidelines often group the signs of canine cognitive dysfunction under DISHAA: disorientation, changes in social interaction, altered sleep-wake cycles, loss of house-training or learned behaviours, altered activity and increased anxiety.
Not every dog will show all of these signs.
Sleep changes may appear before obvious confusion
Getting stuck behind furniture or in corners is one of the signs owners often associate with dementia.
It can certainly happen, but I do not think owners should wait for that before becoming concerned.
Changes in sleep can occur much earlier.
A dog who previously slept through the night may begin waking at 2 am, wandering around the house, pacing or struggling to settle again.
At the same time, they may spend much more of the daytime asleep.
Owners often tell me they thought this was simply because their dog was getting old.
Sometimes it is part of normal ageing, but a persistent change in the sleep-wake cycle is one of the recognised features of canine cognitive dysfunction.
Read more: Understanding Normal Ageing in Dogs
Is it dementia, or could something else be wrong?
I would not diagnose dementia from behaviour alone without considering the rest of the dog.
Older dogs often have several things happening at the same time.
A dog waking at night may have cognitive dysfunction, but they may also be uncomfortable from arthritis or spinal pain. A dog who seems less engaged may have poor vision or hearing. Increased nighttime restlessness can also occur with other medical conditions.
Sometimes the answer is not one or the other.
An older dog may have early cognitive dysfunction as well as arthritis, kidney disease or another chronic condition.
That is why I prefer to look at the whole patient before assuming every behavioural change is dementia.
Read more: Arthritis in Dogs
What I check before diagnosing cognitive dysfunction
I usually start with a good history.
I want to know exactly what has changed, when it started and whether the problem is gradually progressing.
Then I perform a thorough physical examination and usually recommend blood and urine testing to look for other health problems that may be contributing to the change.
Further investigation depends on what I find.
If something does not fit the usual pattern of cognitive decline — for example, a persistent head tilt, seizures or other neurological abnormalities — I would be more concerned about another neurological problem and may recommend additional investigation or imaging.
Canine cognitive dysfunction is generally diagnosed from the pattern of behavioural changes together with the exclusion of other medical causes that could explain them.
Read more: Understanding Dog Blood Work · Longevity Blood Tests for Dogs
What can you do for a dog with dementia?
For many dogs, management begins with lifestyle rather than medication.
I want older dogs to remain involved with the world around them for as long as they comfortably can.
That may include:
- regular interaction with the family
- gentle walks
- sniffing and exploring
- food puzzles or simple enrichment
- short training or engagement sessions
- maintaining a predictable routine
- encouraging more awake and active time during the day
These activities should be appropriate for what the dog can comfortably manage. Even a short sniffing walk, a food puzzle or simply spending more time interacting with the family can help keep an older dog interested in what is going on around them.
Environmental enrichment and mental stimulation are recognised parts of cognitive dysfunction management.
Sleep matters
One of the practical things I pay attention to is the dog's day-night pattern.
If a dog sleeps almost continuously throughout the day, it is not surprising that they may have more difficulty settling at night.
Where the dog is physically able, I often encourage owners to increase gentle interaction and wake time during daylight hours.
That may mean a short walk, spending some time outside, simple food games or just more interaction with the family.
Senior dogs still need plenty of rest, so I would not try to keep them awake for long stretches.
If a dog is sleeping for most of the day, I will often try to build a little more activity and interaction into the daytime. Sometimes this can also help them settle better at night.
Supplements and medication
Some dogs benefit from dietary changes, supplements or medication.
There are diets and nutritional strategies aimed at supporting brain health, and certain ingredients such as medium-chain triglycerides have been used in the management of canine cognitive dysfunction.
Medication may also be appropriate in some patients.
Selegiline is one medication we may use for canine cognitive dysfunction. Whether it is suitable depends on the individual dog and any other medications they are taking.
I also look carefully for pain.
A dog who is uncomfortable may pace, struggle to settle or appear anxious, and appropriate pain control can make a significant difference when pain is contributing to the behaviour.
Do not punish a dog with cognitive dysfunction
This is particularly important when older dogs begin having accidents in the house or vocalising during the night.
If cognitive decline is involved, the dog is not behaving this way deliberately.
They may no longer understand what is expected of them in the same way they once did, and punishment can increase anxiety in a dog who is already confused.
Instead, I would look for ways to make things easier.
That may mean more frequent toilet breaks, easier access to toileting areas, night lights, non-slip flooring, maintaining a predictable routine or changing the sleeping environment.
When does dementia become a quality-of-life concern?
Cognitive dysfunction varies enormously between dogs.
Some dogs have mild changes for a long period and continue to enjoy daily life.
I become more concerned when a dog spends much of the day anxious or unsettled, no longer engages meaningfully with the family, or begins to lose interest in eating.
Night-time behaviour matters too.
If a dog is waking and pacing several times every night, that affects the dog, but it also affects the family caring for them.
Caregiver fatigue is real. A situation where nobody in the household is sleeping properly for weeks or months is difficult to sustain, and this needs to be included when we talk about dementia management with the family.
Read more: Palliative Care for Dogs
What to watch for and record at home
If you have an older dog, I would start noticing their behaviour before the changes become dramatic.
Pay attention to:
- whether they are sleeping much more during the day
- whether their sleep seems unusually deep
- whether they remain interested in family activity
- whether they wake or pace during the night
- whether they become anxious at particular times of day
- whether they get stuck or seem disorientated
- whether house-training changes
- whether their appetite or mobility has changed
A short video of unusual pacing, nighttime behaviour or episodes of confusion can also be very useful when you speak with your veterinarian.
The earlier changes matter
Canine cognitive dysfunction does not always begin with an obviously confused dog.
Sometimes the first thing an owner notices is simply that their dog sleeps all day and no longer sleeps properly at night.
Or they seem just a little less alert and a little less interested in what is going on around them.
Those small changes are worth noticing.
I do not expect every change in an older dog to mean dementia. What I want owners to notice is when their dog's usual behaviour has clearly changed. That is when it is worth checking for other health problems and thinking about what can be done to support them as they age.
Read more: Senior Dog Care: A Veterinarian’s Guide to Helping Your Dog Age Well
References
- American Animal Hospital Association. 2023 AAHA Senior Care Guidelines for Dogs and Cats.
- American Animal Hospital Association. Managing Cognitive Dysfunction and Behavioral Anxiety.
- MSD Veterinary Manual. Behavior Problems in Dogs.
- American Animal Hospital Association. Disease Management: Nutritional.
This article is for educational purposes only and does not replace professional veterinary advice. If your dog is unwell, please consult your veterinarian.