Do Cats Get Dementia? Signs of Feline Cognitive Dysfunction
Yes — and it is common. Over half of cats aged 15+ show signs of cognitive decline. Learn the six warning signs vets look for, what else it could be, and how to help.
An old cat starts howling at three in the morning, stands facing a wall for no reason, or forgets where the litter tray has been for nine years. Most owners file this under “she's just old”. Often it is something with a name: Feline Cognitive Dysfunction — and it is far more common than most people realise.
Quick Answer
- • Yes — cats get dementia. It is called FCD.
- • Roughly a quarter to a third of cats aged 11–14 show signs.
- • Over half of cats aged 15+.
- • Night yowling and disorientation are the classic first signs.
- • Several treatable conditions look identical — see a vet first.
Is your cat in the risk window?
Risk climbs sharply from 11. Check your cat's age in human terms and which life stage they are in.
Open Cat Age CalculatorWhat Feline Cognitive Dysfunction Actually Is
FCD is an age-related decline in brain function, and the underlying changes look remarkably like human Alzheimer's. Affected cats accumulate abnormal protein deposits in the brain, lose neurons, and suffer reduced blood flow to brain tissue. The result is a slow erosion of memory, learning, awareness, and normal sleep patterns.
It is not a sudden event. FCD develops over months and years, which is precisely why it gets missed — each individual change is small enough to explain away. It is only when you look back a year that the pattern becomes obvious.
The Six Signs Vets Look For (DISHAA)
Veterinary behaviourists use a six-point checklist. The letters spell DISHAA, and it is a genuinely useful way to organise what you are seeing:
| Area | What it looks like | |
|---|---|---|
| D | Disorientation | Staring at walls, getting stuck in corners, hesitating in familiar doorways |
| I | Interaction changes | Less interest in people, or unusually clingy; irritable when handled |
| S | Sleep-wake cycle | Sleeps more by day, restless and vocal at night |
| H | House soiling | Missing the litter tray, or forgetting where it is |
| A | Activity level | Less grooming and play; or aimless pacing and repetitive behaviour |
| A | Anxiety | Startles easily, new fears, distress when left alone |
One sign on its own means very little. Several appearing together in a cat over 11, and getting slowly worse, is the pattern that matters.
The Night Yowling
If there is one symptom owners actually notice, it is this. A cat who slept quietly for a decade starts calling out at two or three in the morning — loud, repetitive, often from a hallway or the bottom of the stairs.
What is happening is disorientation in the dark combined with a disrupted sleep-wake cycle. The cat wakes, does not quite know where it is, and calls. It is distressing to listen to and it is genuinely distressing for the cat.
A night light in the hallway helps more than people expect. So does keeping food, water, and a litter tray on the same floor the cat sleeps on, so it does not have to navigate the house in the dark.
Do not diagnose this yourself. Night yowling is also a leading sign of hyperthyroidism and high blood pressure — both common in older cats, and both very treatable. Assuming dementia means missing a condition that could have been fixed.
What Else It Could Be
FCD is a diagnosis of exclusion — meaning the vet rules other things out first. These are the conditions that mimic it most closely:
| Condition | Overlapping signs | Note |
|---|---|---|
| Hyperthyroidism | Night yowling, restlessness, weight loss | Very common over 10; simple blood test |
| High blood pressure | Disorientation, sudden blindness | Often secondary to kidney or thyroid disease |
| Kidney disease | Lethargy, confusion, litter tray changes | Leading cause of decline in older cats |
| Arthritis | Not using the litter tray, less activity | Tray sides may simply be too high now |
| Deafness or blindness | Vocalising, bumping into things | Sensory, not cognitive |
| Dental pain | Irritability, appetite change, poor grooming | Extremely common and very treatable |
The arthritis one catches a lot of owners out. A cat that stops using its litter tray may not have forgotten where it is — it may simply hurt too much to climb over the side. Swapping to a tray with a low entry solves that overnight, and no amount of cognitive support would have.
Managing It at Home
What actually helps
- Change nothing. Keep food bowls, litter trays, and beds in exactly the same places. Predictability is the single biggest comfort for a confused cat.
- Night lights. Low-level lighting in hallways reduces night-time disorientation noticeably.
- Everything on one floor. Food, water, and a low-sided litter tray where the cat sleeps.
- Diet and supplements. Antioxidants, omega-3 fatty acids, and SAMe have evidence behind them. Ask your vet rather than buying blind.
- Gentle stimulation. Short play sessions and puzzle feeders keep the brain working — but keep them easy enough to succeed at.
- Routine. Feed, play, and sleep at the same times every day. It helps reset the sleep-wake cycle.
Worth knowing: FCD progresses slowly and is not itself fatal. Many cats live comfortably for years after the first signs. The goal is not to cure it — it is to keep the cat calm, oriented, and enjoying its days.
When to Book the Vet
Any new night vocalising, litter tray accident, or episode of disorientation in a cat over 10 is worth a visit. Not because it is necessarily dementia — but because the alternatives are treatable and the window for treating them closes.
From eleven, twice-yearly check-ups with blood work and blood pressure become the standard recommendation. Our guide to when a cat is considered senior covers what that routine should include, and how long indoor cats live puts the ages in context.
The Bottom Line
Cats do get dementia, and by fifteen more than half of them show some sign of it. Watch for the DISHAA pattern — disorientation, changed interactions, disrupted sleep, house soiling, altered activity, and anxiety — especially several together in a cat past eleven. Then get the treatable causes ruled out before accepting the diagnosis. It cannot be cured, but a stable environment, good routine, and the right diet make a real difference. Check where your cat sits with the Cat Age Calculator. 🐱
Frequently Asked Questions
Do cats get dementia?
Yes. The condition is called Feline Cognitive Dysfunction, or FCD, and it is the cat equivalent of Alzheimer's in people. Studies suggest around a quarter to a third of cats aged 11 to 14 show at least one sign, rising to more than half of cats aged 15 and over. It is genuinely common, and it is badly under-diagnosed because owners assume the changes are just old age.
What are the first signs of dementia in cats?
The earliest sign is usually a change in the sleep-wake cycle — sleeping more in the day and becoming restless or vocal at night. Loud night-time yowling in an otherwise healthy older cat is one of the most recognisable early symptoms. Disorientation follows: staring at walls, getting stuck in corners, or hesitating in familiar doorways.
At what age do cats get dementia?
Signs rarely appear before 10. The risk climbs sharply from 11 onwards and again after 15. That said, age alone never confirms it — several treatable conditions cause identical symptoms in older cats, so a vet needs to rule those out first.
Why is my old cat yowling at night?
In cats over 11 this is one of the classic signs of cognitive dysfunction — the cat becomes disoriented in the dark and calls out. But it is also a symptom of hyperthyroidism, high blood pressure, deafness, and pain. Night yowling always deserves a vet visit rather than a conclusion, because several of those causes are very treatable.
Can cat dementia be treated?
There is no cure, but it can be slowed and managed. Vets may recommend diets rich in antioxidants and omega-3 fatty acids, supplements such as SAMe, and in some cases medication. Just as important is the environment: keeping routine, food bowls, and litter trays exactly where they are, and adding night lights. Cats with FCD cope far better with predictability than with change.
How long can a cat live with dementia?
Cognitive dysfunction itself is not fatal and progresses slowly, so many cats live for years after the first signs appear. What matters is quality of life — whether the cat still eats, still seeks contact, and is not distressed. Most cats with FCD are eventually lost to something else entirely, such as kidney disease.