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Canine cognitive dysfunction is the name for a gradual decline in an older dog's thinking: memory, learning, awareness of place, and the routines that once ran on autopilot. It is a physical change in the aging brain, often compared with Alzheimer's disease in people, and it is not the same thing as a dog simply slowing down. It cannot be cured, and it does progress, but it can be recognised early, other causes can be ruled out, and much can be done to keep an affected dog comfortable, oriented and engaged. Our senior cognitive health overview is the shorter introduction; this page is the working guide.
Veterinary behaviourists sort the signs into six loose groups, and the DISHAA assessment tool used with veterinarians scores them item by item. Described in plain terms, look for:
Pick a quiet moment and score what you have actually seen over the last month, not the worst night you can remember. For each area above, jot down one or two concrete examples with rough frequency: daily, weekly, once. The DISHAA tool scores individual behaviours from 0 for none to 3 for severe, and your notes, brought to the appointment, are far more useful to your veterinarian than a general feeling that the dog is "not himself". Repeat the exercise every month or two; the trend is the information.
The Ohio State Indoor Pet Initiative makes the central point plainly: cognitive dysfunction is a diagnosis reached after medical explanations have been ruled out. Pain, thyroid and other hormone problems, kidney and liver disease, high blood pressure, failing eyesight or hearing, and plain arthritis can all produce signs that look like confusion, night waking or withdrawal. Some of those are very treatable, which is why the first step is a senior workup, usually an examination with blood and urine testing, rather than an assumption. Expect your veterinarian to ask when signs started, whether they came on gradually (cognitive decline is normally slow) and what has changed at home. Sudden confusion is a different problem and deserves a prompt appointment, not a wait-and-see.
Related reading: senior vet checks for what the twice-yearly senior visit should cover, and assessing quality of life when changes start to add up.
Normal aging slows a dog down; cognitive dysfunction changes how the dog thinks. Getting stuck in corners, staring into space, forgetting housetraining, night waking and not recognising familiar routines point beyond ordinary slowing. Only a veterinarian can separate the two, because several treatable medical problems imitate the same signs.
It is a condition of older dogs, most often noticed in the senior years, and the likelihood rises steeply with age. Any new behaviour change in a senior dog is worth raising at a checkup rather than writing off as old age.
There is no single blood test. Your veterinarian uses your reported history of signs, an examination, and usually blood and urine testing to rule out medical causes such as thyroid disease, kidney problems or pain. The Ohio State Indoor Pet Initiative describes the diagnosis as one made when the sign pattern cannot be explained by another disease.
No, it is a progressive condition and lost function does not come back. What treatment can do is slow the slide for some dogs and, just as importantly, fix the lookalike problems, reduce anxiety, restore sleep, and make the home easier for the dog to navigate.
It might be, but night waking also comes from pain, needing the toilet more often, thyroid problems and other medical causes. Book a senior workup: if pain or disease is driving the nights, treating it often restores sleep, and if the cause is cognitive, your veterinarian can build a plan for that instead.
Keep furniture, feeding spots and routines stable, add gentle sniffing and food games, give a last toilet trip and a nearby bed at night, and re-score the signs every month or two so changes are caught early. Bring those notes to your twice-yearly senior visits.
This page is general information drawn from the published guidance of the organizations listed under Sources below. It is not veterinary advice, and it does not replace your own veterinarian, who knows your dog. If your dog has eaten something toxic, contact your veterinarian, the ASPCA Animal Poison Control Center on (888) 426-4435, or the Pet Poison Helpline on (855) 764-7661 straight away. A consultation fee may apply on the helplines.
Last updated: November 2026. Sign groupings follow the DISHAA framework and the Ohio State guidance linked above; scoring and diagnosis belong with your veterinarian. How we work: our methodology.