Is Your Cat 11 or Older? You May Want to Read This — Cat Dementia
Feline Cognitive Dysfunction Syndrome (cat dementia) is common but often missed. Learn the VISHDAAL screening framework to spot early warning signs, assess your cat's cognitive health, and know when to seek veterinary care.
At a Glance
Feline Cognitive Dysfunction Syndrome (CDS) — what many cat parents and vets call cat dementia — affects an estimated 28% of cats aged 11–14 and over 50% of cats aged 15 and older. Yet the condition is diagnosed in fewer than 3% of cases — not because anyone fails their cat, but because cats hide decline with an evolutionary precision that makes early detection genuinely difficult.
If your old cat has started yowling at night, your cat is pacing at 3 AM, the litter box is being ignored, or your senior cat is staring at walls, hiding more than usual, or seems confused in her own home — those are not quirks of old age. They are behaviour changes that may point to a condition that, while not curable, is manageable — and the earlier you catch it, the more you can do about it.
VISHDAAL is a screening framework designed specifically for cats by veterinary
researchers at the University of Edinburgh. Unlike DISHAA — the equivalent framework for dogs — VISHDAAL accounts for the ways feline cognitive decline presents differently: it adds Vocalisation (the single most common sign in cats) and Learning and Memory as dedicated categories, and it reorders all eight domains by how frequently cats display them. This matters because the behaviours that signal cognitive decline in cats are not the same as in dogs — and the tools used to detect it should not be either.
This guide walks you through each of the eight VISHDAAL categories with practical, home-specific context, a simplified scoring table, and a link to our free interactive assessment tool here. If your cat scores in the moderate or significant range, it is time for a vet conversation — not next month, now.
The earlier you catch it, the more you can do about it. Read on.
The Full Guide
You probably noticed something before you knew what to call it. Maybe it was the
cat yowling at night — a sound you had never heard your old cat make in fourteen
years, loud and low and aimed at nothing. Maybe it was the morning you found her
standing in the hallway, facing the wall, perfectly still, as though she had forgotten
where the kitchen was. Or maybe it was the litter box: your fastidiously clean Persian, who had never missed in twelve years, suddenly eliminating on the bathroom floor three steps from the box she has used her entire life.
You told yourself it was nothing. Just age. Just a bad night. Just a phase.
It might not be nothing.
Feline Cognitive Dysfunction Syndrome affects an estimated 28% of cats between
the ages of 11 and 14, and over 50% of cats aged 15 and older. A large longitudinal
study found that by age 13, every cat in the cohort displayed at least one behavioural change consistent with cognitive decline. And here is the number that should stop you: only about 2.9% of affected cats ever receive a formal diagnosis. The condition is not rare. It is invisible — because cats are extraordinarily good at making it so. Dogs with cognitive decline pace the hallway and bark at 2 AM in ways their families cannot miss. Cats withdraw. They hide. They stop doing things rather than start doing things — and the absence of a behaviour is infinitely harder to detect than its presence. The framework designed for dogs — DISHAA — captures canine cognitive decline well. But cats present differently, and they deserve a tool that accounts for those differences.
That tool is VISHDAAL.
What Is VISHDAAL?
VISHDAAL is an acronym for the eight behavioural domains that change when a cat’s brain begins to decline. It was proposed in 2021 by Dr Lorena Sordo and Professor Danielle Gunn-Moore at the University of Edinburgh’s Royal (Dick) School of Veterinary Studies and The Roslin Institute — one of the world’s leading feline medicine research centres.
The eight categories are:
The categories are deliberately ordered from most to least commonly reported in
cats. Vocalisation comes first because it is the sign that most frequently drives cat
parents to seek help — or to search the internet at 3 AM. Learning and memory
comes last because it is the hardest for owners to observe directly.
The framework was published in the Veterinary Record and funded by BSAVA
Petsavers and Boehringer-Ingelheim. In their paper, Sordo and Gunn-Moore stated
directly that cats with CDS present differently from dogs, and that a separate feline
acronym was needed. VISHDAAL is that acronym.
That is the clinical picture. Here is what it looks like in your home.
V — Vocalisation: The 2 AM Yowling That Will Not Stop
Cat parents often describe this as: “she screams at 2 AM for no reason,” “he yowls
like he is in pain but the vet says nothing is wrong,” or “it is the most disturbing
sound I have ever heard a cat make.” If that sounds familiar, this is the VISHDAAL
category that explains what you are hearing.
What it looks like
A long, loud, guttural yowl between midnight and dawn — distinct from a normal
meow in pitch, volume, and duration. Cat parents describe it as “cat screaming,”
“wailing,” or “sounding like an injured animal.” It is not a request for food. It is not a
request for attention. It is not directed at another cat, at a closed door, or at anything visible. Your cat may vocalise while pacing, while standing still facing a wall, or while sitting alone in an empty room. The sound often wakes the household and, in apartments with shared walls, the neighbours.
This is the most commonly reported sign of feline CDS. Studies suggest over 60% of cats with cognitive dysfunction display excessive or changed vocalisation. A 2020 study specifically examining vocalisation in elderly cats with CDS found that 62% of owners were regularly woken at night, 40% attributed the yowling to disorientation, and 40% to attention-seeking. One cat was rehomed. One owner resorted to sleeping pills.
What it means
Vocalisation in feline CDS appears to reflect disorientation, distress, or a failure to
recognise the environment. The cat is not being difficult. She may genuinely not know where she is. The circadian disruption that accompanies cognitive decline (see Sleep-wake below) amplifies the behaviour: the darkness, the silence, the absence of visual anchors that daytime provides — all of this makes the disorientation worse after dark.
This is also why VISHDAAL places vocalisation first, while DISHAA (the dog framework) does not separate it at all. In dogs, vocalisation changes occur but are not a predominant or defining feature. In cats, night yowling is often the single behaviour that drives the family to search for answers.
What to watch for in your home
In compact apartments, the yowling carries through shared walls and floors. If your
cat’s nighttime vocalisations have changed in character — louder, more persistent,
aimed at nothing — and the pattern has continued for more than two weeks, this is
worth a vet conversation. Your vet will want to rule out pain, hyperthyroidism, and
hypertension first (all three cause increased vocalisation in senior cats). If those are
cleared, cognitive decline becomes the leading explanation.
I — Interaction Changes: The Cat Who Became a Shadow, or the Cat Who Disappeared
Cat parents often describe this as: “she follows me everywhere now — even to the
bathroom,” or the opposite: “he hides under the bed all day and I barely see him.”
Both patterns can point to the same condition.
What it looks like
The signature feline CDS interaction change — and one of the most counterintuitive
— is increased affection and clinginess. Your cat follows you from room to room. She demands constant lap time. She vocalises the moment you stand up. She sleeps pressed against you when she previously kept a dignified distance. Studies show this is the second most common VISHDAAL sign, affecting roughly half of cats with CDS — and the reason it goes unnoticed is that most people experience it as a positive change. Your cat seems to love you more. In reality, your cat may be losing her ability to navigate the world on her own, and you are the one fixed point.
Conversely, some cats withdraw entirely. A cat who was always social now hides
under the bed, inside a cupboard, or behind the washing machine for hours. She
stops greeting you at the door. She no longer comes to the kitchen at feeding time — a routine that was previously as reliable as sunrise. In multi-cat households, the
social hierarchy may shift: a previously confident cat becomes submissive, avoids
communal sleeping spots, or is pushed aside at the food bowl by younger
housemates who sense the change.
What to watch for in your home
The key signal is change from baseline. An independent cat who becomes clingy is
telling you something. A social cat who starts hiding is telling you something. Neither pattern is alarming on its own — but if the shift persists for more than two weeks and you cannot identify a trigger (new pet, new furniture, new routine), it belongs in your log.
S — Sleep-Wake Cycle: Sleeping All Day, Restless All Night
Cat parents often describe this as: “she sleeps the entire day and then paces the
home at 3 AM,” “his days and nights are completely reversed,” or “it is like living with a newborn.”
What it looks like
Your cat sleeps deeply and heavily through the day — more than the 16–18 hours that is normal for a senior cat. Then, after dark, she is up. Pacing. Vocalising. Walking the same circuit through the home: hallway to kitchen to bedroom to hallway, over and over. She may sit in the middle of the room at 4 AM, alert but apparently purposeless. The pattern does not correct itself. It builds over weeks.
What it means
The suprachiasmatic nucleus — the brain’s internal clock — degrades with age, and
cognitive decline accelerates the process. The result is a fragmented circadian
rhythm where the normal sleep-wake boundary dissolves. This parallels the
sundowning pattern seen in human Alzheimer’s patients and in dogs with CDS:
agitation and confusion that worsen in the evening and peak after dark.
What to watch for in your home
Cats are naturally crepuscular (most active at dawn and dusk), so some nighttime
activity is normal. The signal is not activity itself but a change in pattern — a cat
pacing for hours through the night when she previously slept through until morning.
Combined with vocalisation (Category V), this is the VISHDAAL pairing that most
disrupts the household. In apartment buildings, the nighttime pacing on tile or
marble floors creates noise that carries. If this pattern has persisted for more than
two weeks, mention it to your vet.
H — House-Soiling: Missing the Litter Box After Years of Being Perfect
Cat parents often describe this as: “she has used her litter box perfectly for twelve
years and now she goes on the floor right next to it,” “he started peeing on the bed,” or “I find accidents in the strangest places.”
What it looks like
A cat who has been reliably litter-trained for years begins eliminating outside the
box. She urinates on the bathroom floor three steps away. He defecates in the
hallway. She stands in the litter box but hangs over the edge. He goes to a corner of the bedroom he has never used before. The shock is palpable — cat parents
consistently emphasise how reliable their cat was: “she never had an accident.”
What it means
House-soiling is the number one reason for behavioural referral in senior cats, and it
has many possible causes. Cognitive decline is only one of them. Arthritis can make
high-sided boxes painful to enter. Kidney disease increases urine volume and urgency. Diabetes, hyperthyroidism, and urinary tract infections all affect elimination
patterns.
The cognitive component is the forgetting: the cat who walks past the litter box as
though it is not there, or who eliminates in a random, illogical location suggesting she has lost the spatial memory of where to go. Your vet will need to rule out medical causes first — urinalysis, blood panel, pain assessment — before attributing house-soiling to CDS.
What to watch for in your home
This is the one VISHDAAL category with no real canine equivalent. Dogs eliminate
outdoors; there is no indoor baseline to monitor. The litter box gives you a daily,
observable behavioural metric. Pay attention to where your cat eliminates: if it is
consistently beside the box, the issue may be mobility (the sides are too high). If it is in random, unrelated locations — the middle of the living room, under the dining
table — the issue may be cognitive. Log the location, time, and frequency.
D — Disorientation: Staring at Walls, Getting Lost at Home
Cat parents often describe this as: “she stares at the wall for minutes at a time,” “he
gets stuck behind the sofa and cannot figure out how to get out,” or “she seems lost in her own home.”
What it looks like
Your cat stares at a wall, or at a corner, with a blank expression for extended periods. She walks into a room and stops, as though she has forgotten why she came. He gets wedged behind furniture and stands there, seemingly unable to work out how to reverse. She goes to the hinge side of a door rather than the opening side. In a compact home, your cat may pace the same short hallway repeatedly, appearing unable to locate the food bowl she has walked to ten thousand times.
What it means
Spatial disorientation reflects deterioration in the hippocampus and prefrontal cortex — the brain regions responsible for mapping the environment. Cats with CDS develop amyloid-beta plaques (the same protein deposits found in human Alzheimer’s disease), and unlike dogs, some cats also develop tau neurofibrillary tangles — making the feline brain a closer parallel to human Alzheimer’s than any other common companion animal. A 2020 neuropathology study found amyloid deposits in 84% of aged cat brains, with nearly universal prevalence in cats over 14.
What to watch for in your home
In smaller homes, spatial confusion can be subtle — because there are fewer rooms
to get lost in. Watch for your cat failing to navigate obstacles she once stepped
around without thinking: a chair pulled out from the table, a bag left in the hallway, a
new piece of furniture. These are not clumsiness. They are signals.
A — Activity Changes: Lost Interest in Everything, or Circling Without Purpose
Cat parents often describe this as: “she just sits there — she used to play every day,” “he walks in circles like he cannot stop,” or “she has stopped grooming herself.”
What it looks like
Your cat loses interest in toys she has loved for years. The laser pointer that once
produced acrobatics now barely gets a head turn. Interactive play sessions become
one-sided — you play, she watches. Conversely, some cats develop repetitive
behaviours: walking the same circuit through the home, circling, excessive licking, or staring fixedly at a spot on the ceiling.
Reduced grooming is one of the most reliable early signals. A cat who has always
kept herself immaculately clean and now has a matted, dull, or greasy coat —
particularly behind the ears or along the spine — is telling you something. She may
have arthritis that makes twisting to groom painful. She may have dental pain. Or the cognitive executive function required to initiate and sustain a grooming sequence may be fragmenting.
What to watch for in your home
Activity decline in indoor cats is easy to miss because the baseline is already low. A
cat whose world is a two-bedroom home may not show dramatic changes in movement. The signal is not the quantity of movement but the quality of interest.
Does she still investigate when you open a cupboard? Does she still track a bird
outside the window? Does she still come to the kitchen when she hears the food tin? The loss of curiosity and anticipation is the cognitive marker, not the loss of metres walked.
A — Anxiety: New Fears in a Cat Who Was Never Fearful
Cat parents often describe this as: “she is suddenly scared of everything,” “he hides whenever anyone comes over — he never used to do that,” or “something is off — she is not herself.”
What it looks like
New fearfulness in a cat who was previously confident. Exaggerated startle
responses to normal household sounds — the vacuum, the doorbell, dishes being put away. Hiding in cramped, unusual spaces not previously used: behind the
refrigerator, inside a cabinet, under a bathroom sink. Increased reactivity or
unprovoked aggression toward familiar people or other household pets. Anxiety that
visibly worsens in the evening — the feline equivalent of sundowning.
What it means
Anxiety in CDS is not a personality change. It is the consequence of a brain that can
no longer make reliable predictions about its environment. When spatial memory
fails, when familiar sounds become confusing, when the circadian rhythm that once
structured the day breaks down, the world becomes unpredictable — and unpredictability is the neurological definition of threat. The anxiety is real, it is
neurochemical, and it deserves treatment, not dismissal.
What to watch for in your home
Festival and firework seasons — Diwali, New Year’s Eve, Fourth of July, Guy Fawkes
Night, Chinese New Year — create a compounding problem. If your senior cat already. has emerging CDS, noise and disruption can amplify every VISHDAAL domain simultaneously. If your cat’s behaviour deteriorated sharply during a festival period and did not fully return to baseline within two weeks, that residual change may be CDS unmasked by stress. Note it. Mention it to your vet.
L — Learning and Memory: Forgetting the Routines of a Lifetime
Cat parents often describe this as: “she does not come for dinner any more — she
has come every day for thirteen years,” “he begs for food ten minutes after eating,”
or “she looks at me like she does not know who I am.”
What it looks like
Your cat stops coming to the kitchen at feeding time despite a decade of clockwork
reliability. She begs for food shortly after eating, as though she has forgotten the
meal happened. He no longer responds to his name — not because he cannot hear
you (though hearing loss should be assessed), but because the association between the sound and himself has weakened. She appears confused when a long-term family member approaches her, as though encountering a stranger.
What it means
Learning and memory is the last category in VISHDAAL because it is the hardest for
owners to observe directly. You cannot give your cat a memory test. What you can
notice is the erosion of deeply ingrained routines — the habits so automatic that their absence is jarring. A cat who has greeted the same person at the same door every day for ten years and suddenly stops is not being aloof. She may be losing the
associative memory that connected the sound of the key with the person she loves.
What to watch for in your home
Minor environmental changes are a useful litmus test. Cats with intact cognition
adapt quickly when you rearrange furniture or move the food bowl to a new spot.
Cats with cognitive decline may fail to find the relocated bowl, become agitated by
rearranged rooms, or take days to adjust to a change that a younger cat would
navigate in minutes. If your cat is struggling with routine environmental changes, this is worth noting in your log.
Why Cats Are Harder to Read
If feline CDS is as common as the research suggests, why is it diagnosed so rarely?
The answer lies in the nature of cats themselves.
Cats mask illness with evolutionary precision. As a species that evolved as both
predator and prey, cats suppress visible signs of pain and vulnerability instinctively. A dog in discomfort limps, whimpers, and signals distress in ways humans read easily. A cat in discomfort simply stops doing the thing that hurts. The jump she no longer makes, the shelf she no longer visits, the play session she no longer initiates — these absences are the symptoms. And absences, by definition, are easy to miss.
The sedentary baseline obscures the signal. Indoor cats already spend the vast
majority of their day sleeping. When CDS causes increased sleep or decreased
activity, the change is nearly imperceptible against a baseline of 16–18 hours of sleep per day. Dogs, walked daily and interacted with frequently, provide far more
behavioural data points for comparison.
The earliest sign is often perceived as love. Increased clinginess and affection-
seeking — one of the most common early signs of feline CDS — is almost universally interpreted as a positive change by owners. Researchers have found that 96% of
owners of cats with CDS reported loving their cat as much or more than before. The
condition may actually strengthen the owner’s perception of the bond while the cat’s cognition is deteriorating.
Vet visits mask it further. Cats dramatically alter their behaviour under the stress of a clinic visit, suppressing the very signs that would signal CDS at home. The
disorientation, the night vocalisation, the aimless wandering — none of these are
visible during a 15-minute exam. Home video documentation is now recommended
by feline medicine specialists.
The Conditions That Must Be Ruled Out First
CDS is a diagnosis of exclusion. Before your vet can attribute behavioural changes to cognitive decline, several common senior cat conditions that produce overlapping signs must be investigated:
Hyperthyroidism causes vocalisation, restlessness, weight loss despite increased
appetite, and irritability. It is extremely common in senior cats and must always be
the first rule-out. A simple blood test (total T4) can detect it.
Systemic hypertension (high blood pressure) can cause disorientation and
confusion directly, and can cause sudden blindness through retinal detachment. It is
often secondary to kidney disease or hyperthyroidism. Blood pressure measurement should be part of every senior cat’s check-up.
Osteoarthritis is present radiographically in over 90% of cats over age 12. It reduces activity, alters sleep positions, impairs grooming, and makes litter box access difficult. It frequently coexists with CDS, making separation of the two conditions challenging.
Pain from dental disease, abdominal conditions, or musculoskeletal issues can
produce withdrawal, hiding, decreased appetite, and changed social behaviour — all
of which overlap with VISHDAAL categories.
Your vet will likely recommend a full clinical history with behavioural assessment,
physical examination (including mobility, eyes, and thyroid palpation), blood
pressure measurement, complete blood work, total T4, urinalysis, and a pain
assessment. If these investigations are clear and the behavioural changes persist,
CDS becomes the leading diagnosis.
The Simplified VISHDAAL Score
The table below is a simplified scoring tool designed for this article. It is not the full
clinical assessment — the interactive VISHDAAL access it here. It uses a more detailed 5-point frequency scale across all eight categories. This simplified version gives you a quick snapshot.
For each category, assign a score based on what you have observed in the last 30
days:
For a more detailed assessment with per-category scoring and severity breakdowns, use the free interactive VISHDAAL check the tool here. It covers all eight VISHDAAL categories with a 5-point frequency scale and generates a shareable report for your vet.
What Comes Next
This article is a starting point, not a destination. If what you have read here sounds
familiar — if you have recognised your cat in these descriptions — here is where to go next:
Use the interactive tool. Our VISHDAAL assessment gives you a structured, category-by-category assessment you can share directly with your vet.
Read the companion article for dogs. If you also have a senior dog, or know someone who does, read our DISHAA guide, it covers the six-category canine framework with the same depth.
Start a log. The most useful thing you can bring to a senior cat’s vet appointment is not a worried feeling — it is a record. Note the date, the behaviour, the time of day, and how it compares to last week. Video is even better. A vet who sees a 30-second clip of the 2 AM yowling can act on that. A vet who hears “she seems a bit off” has much less to work with.
The bond between you and your ageing cat is not diminishing. It is asking more of
you — more attention, more patience, more willingness to see what your cat cannot tell you in words. That is not a burden. It is the most important work of cat
parenthood.
Sources Cited in This Article
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