Canine cognitive dysfunction (CCD), often called dog dementia, shows up as a cluster of changes rather than one dramatic symptom. Vets group them under the acronym DISHAA: disorientation, changes in social interactions, sleep-wake cycle disruption, house soiling or lost learning and memory, changes in activity level, and anxiety. The earliest sign is often a quiet one, such as a dog who restlessly paces at night and sleeps more by day. If you notice more than one of these, book a veterinary visit. Many other treatable conditions look the same.
TL;DR
- CCD signs fall into six groups, remembered as DISHAA: Disorientation, Interactions, Sleep-wake cycle, House soiling/learning/memory, Activity, Anxiety.
- Night restlessness and daytime sleepiness are frequently the first signs, and they are easy to miss.
- Pain, vision or hearing loss, and organ disease can mimic dementia, so CCD is a diagnosis of exclusion. Only a vet can make it.
- Prevalence climbs steeply with age, from 8.1% in dogs aged 8 to 11 to 67.3% at 15 to 17.
- A few weeks of notes on sleep, eating, walking and play give your vet far better information than memory alone.
Table of Contents
- What canine cognitive dysfunction is
- The DISHAA checklist, sign by sign
- The earliest signs are often the quietest
- Normal aging or something more?
- What else can look like dementia
- How to prepare for the vet visit
- What management looks like
- Our perspective: routine is the signal
- Tracking your senior dog’s routine with Fudini
- FAQ
- Sources
What canine cognitive dysfunction is
CCD, also written CCDS for “syndrome,” is a neurodegenerative disorder that mostly affects geriatric dogs. A 2025 review in the American Journal of Veterinary Research puts the estimated prevalence at 8.1% for ages 8 to 11, 18.8% for ages 11 to 13, 45.3% for ages 13 to 15, and 67.3% for ages 15 to 17.
Researchers describe it as a canine analog of Alzheimer’s disease, marked by behavior changes that develop with advanced age. It is a physical disease of the aging brain. It is not a character flaw, stubbornness, or something your dog is doing on purpose.
The CCDS Working Group guidelines, published in JAVMA, treat the condition as a spectrum rather than a yes-or-no diagnosis. They propose three severity stages: mild, moderate and severe. Most owners meet the disease in the mild stage, when signs are subtle and easy to explain away as “just getting older.”
The DISHAA checklist, sign by sign
Veterinary sources, including AAHA’s senior care guidelines and VCA Animal Hospitals, use DISHAA as the working framework. Here is what each letter tends to look like at home.
D: Disorientation
Your dog seems lost in a place he knows well. Typical examples:
- Standing in a corner or facing a wall, unsure how to turn around
- Staring at walls or into space
- Going to the hinge side of a door instead of the opening side
- Getting stuck behind furniture
- Failing to recognize familiar people or places
One episode proves nothing. A pattern that grows over weeks is what matters.
I: Changes in interactions
Social behavior shifts. A dog who once greeted you at the door may stop. Others become clingy and follow you from room to room. Some lose interest in petting, or grow irritable with other pets or visitors. Reduced responsiveness to familiar people and commands is one of the classic behavior changes researchers list.
S: Sleep-wake cycle disruption
This is the sign owners most often describe first. Dogs may pace or vocalize in the middle of the night, then sleep heavily during the day. Some show agitation or confusion around dusk, which owners sometimes call sundowning.
There is a biological basis for it. A 2023 study reported by Frontiers found that older dogs with dementia sleep less deeply, much as people with Alzheimer’s do. Sleep changes are among the earliest and most commonly reported signs.
H: House soiling, learning and memory
A reliably house-trained dog starts having accidents, often without any sign of embarrassment. He may also forget cues he has known for years, or fail to signal at the door. Because accidents also come from urinary infections, kidney disease, diabetes and arthritis pain, this sign alone points nowhere. It still deserves a vet visit.
A: Activity level
Activity can go either way. Many dogs become less interested in play, toys and walks. Others show purposeless activity: pacing, wandering, circling, or repetitive motions. Appetite may also change, and some dogs lose interest in food they once loved.
A: Anxiety
New fears can appear: separation anxiety in a dog who never had it, wariness of rooms or surfaces, sensitivity to noise, or clinging at night. Anxiety is both a sign of CCD and a consequence of living with a brain that makes the world feel unfamiliar. Treating it is part of care.
The earliest signs are often the quietest
The dramatic signs, like wandering at 3 a.m. or getting lost in the yard, usually come later. According to the 2025 Working Group guidelines, early signs such as sleep disturbance and lower daytime activity are subtle. That is why they recommend owners track their dog’s routine, so the vet has concrete, longitudinal data.
The AKC notes that the condition progresses slowly, often starting with only one or two signs before fuller indicators appear. Signs may begin around age nine.
Physical changes can also come first. A study indexed in PubMed Central found that impaired vision or smell, tremors, and postural instability such as swaying or falling are significantly associated with CCD. If you see any of these, mention them to your vet promptly, even if your dog is still behaving normally.
What a slow slide looks like in practice
The following is an illustration, not a real case. Imagine a 12-year-old retriever. In month one, he starts waking at 2 a.m. for a lap of the kitchen. By month two, he naps more in the afternoon and skips the second walk. By month three, he has two indoor accidents and stares at the pantry door. No single week looks alarming. Taken together, the trend is clear.
This is why a calendar or a log beats memory. Owners adapt quickly to slow change and stop noticing it.
Normal aging or something more?
Slight lapses in attention and memory are part of normal aging. The difference is in the number of signs, their persistence, and whether they interfere with your dog’s daily life. The Working Group guidance says recognizing more than one DISHAA sign warrants a professional veterinary evaluation.
The same guidance pushes back on the idea that “senior moments” are simply inevitable. They are medical indicators that call for a structured workup.
| Normal aging | Worth a vet visit |
|---|---|
| Slows down on long hikes | Paces or vocalizes at night most nights |
| Sleeps a bit more overall | Day-night sleep pattern flips |
| Occasional missed cue when distracted | Forgets cues or routines held for years |
| Mild stiffness after exercise | Stands stuck in corners or at the wrong side of doors |
| Accident after a very long day | Repeated accidents in a reliably house-trained dog |
What else can look like dementia
CCD is a diagnosis of exclusion. The 2025 guidelines state that medical conditions, including pain, organ dysfunction and metabolic issues, must be managed before a CCDS diagnosis is confirmed. Common look-alikes include:
- Chronic pain. Arthritis and other discomfort can mimic changes in social interaction, sleep-wake cycles, house soiling and activity. A JAVMA-hosted summary lists these overlaps.
- Hearing or vision loss. A dog who cannot see or hear may seem confused or startle easily.
- Metabolic disease, such as liver disease, and other organ problems.
- Other brain disease. AAHA notes that CCD signs may resemble other intracranial diseases.
A proper workup usually includes a history, neurologic and orthopedic exams, and lab work. Failing to treat these other problems can make cognitive signs look worse than they are. It also means a dog can have both conditions at once.
How to prepare for the vet visit
Vets say the signs are subjective, and that makes them hard to separate from other conditions. You can make their job easier.
- Write down what you see, with dates. Note night waking, accidents, missed cues, new fears.
- Record a video of any strange behavior, such as staring, circling, or getting stuck. Dogs often act normal in the exam room.
- Track the baseline. How long does your dog usually sleep, eat, walk and play? Compare this month with three months ago.
- List medications, supplements and food. Some can affect sleep and alertness.
- Mention physical signs: tremors, swaying, trouble with stairs, and changes in sight or smell.
- Ask about staging. Whether the signs look mild, moderate or severe affects the plan.
A vet will decide on any testing and treatment. Do not start medication or supplements for suspected dementia without that conversation.
What management looks like
There is no cure, but early action helps. Experts describe a multi-modal approach: medication where appropriate, environmental enrichment, consistent routines, and a therapeutic diet rich in antioxidants and medium-chain triglycerides. Enrichment can include puzzle toys, interactive play and short controlled walks.
Selegiline is the only FDA-approved drug for the condition. In a 2025 survey of US veterinarians, 43.3% named pharmaceuticals as the most effective strategy, yet only 29.2% picked selegiline as the single most effective product. The takeaway is that no one pill does the job alone. Whether your dog is a candidate is a question for your vet.
At home, small changes matter: keep furniture where it is, add night lights, keep feeding and walk times steady, and make sure the dog has an easy path to the yard.
Our perspective: routine is the signal
We build a collar that learns what is normal for one dog. It tracks four behaviors: eating, sleeping, walking and playing. Over a few weeks it forms a baseline, then alerts you only when your dog’s behavior drifts from it.
We came to this from a simple observation. The early signs of cognitive decline are exactly the ones people are worst at noticing: slow shifts in sleep, a little less play, a slightly different walk. They are gradual, and you live with them every day. A dog’s routine can change by 20 minutes here and there without any single day standing out.
We also hold firm on what this is not. A collar cannot diagnose dementia, and we do not claim it can. What it can do is give you and your vet a timeline, so a conversation starts from “here is what changed over six weeks” and not “he seems off.” The vet still has to rule out pain, sensory loss and illness.
Our approach is built around not burying you in raw numbers. Alerts should be rare and mean something. If you are curious how we do it, our build log explains how a neural net learns what a dog eating looks like and why we are moving activity classification off the collar.
— Denys
Tracking your senior dog’s routine with Fudini
If your dog is entering the years when CCD becomes more common, a record of normal behavior is worth having before anything changes. The Fudini App is built for iOS and works with our sensor collar. It learns each dog’s routine and flags meaningful drift, so you have something concrete to bring to your vet. You can also see how the whole system works on the Fudini homepage. The app includes wellness and weight tracking, and a library of fact-checked pet care guides that are free and not sponsored.
FAQ
What are the first signs of canine cognitive dysfunction?
Night restlessness and daytime sleepiness are frequently the earliest signs, according to the 2025 Working Group guidelines. Subtle physical signs, such as tremors or swaying, may also come first. Because these are easy to overlook, tracking your dog’s routine over weeks helps.
At what age do dogs get dementia?
Signs can begin around age nine, though they are often mild at first. Estimated prevalence rises from 8.1% at ages 8 to 11 to 67.3% at ages 15 to 17, per the AJVR review. Any senior dog with new behavior changes deserves a checkup.
Can a vet test for CCD?
There is no single test. Diagnosis rests on a behavioral history plus exams and lab work that exclude other causes, such as pain, sensory loss and metabolic disease. Your vet may use a DISHAA-based questionnaire as part of this.
Is dog dementia reversible?
No. It is a progressive condition, but early, multi-modal management may slow its impact on quality of life. Your vet can tailor a plan involving diet, enrichment, routine and possibly medication.
When should I call the vet?
Call when you notice more than one DISHAA sign, or any sudden change such as new disorientation, falls or tremors. Sudden onset can signal a different problem that needs prompt attention. Do not wait for the next annual visit.
Sources
- CCDS Working Group guidelines for diagnosis and monitoring (JAVMA)
- Recent advances in diagnostic and therapeutic strategies for CCD (AJVR)
- Current practices for diagnosis and management of CCDS in the United States (Frontiers)
- Old dogs with dementia sleep less deeply (Frontiers)
- Physical signs of canine cognitive dysfunction (PMC)
- Managing Cognitive Dysfunction and Behavioral Anxiety (AAHA)
- Senior Pet Cognitive Dysfunction (VCA Animal Hospitals)
- Dog Dementia: Signs, Symptoms, Treatments (AKC)