Dog Dementia (CCD) UK 2026 - Signs, Stages, and What to Do at Home

What is canine cognitive dysfunction (CCD)

Canine cognitive dysfunction is the dog equivalent of Alzheimer's disease. It is a progressive neurodegenerative condition that affects roughly 1 in 3 dogs over 11 and 2 in 3 dogs over 15. The brain accumulates amyloid plaques and tau tangles, the same physical changes seen in human Alzheimer's. Memory, learning, and spatial awareness decline.

CCD is not "just getting old". A healthy senior dog still recognises family members, finds the food bowl, and responds to cues. A dog with CCD starts to lose these abilities. The difference matters: a senior dog who is "just slow" is treatable with environmental changes; a senior dog with CCD needs both environmental support and a vet-led care plan.

The DISHA signs

The 5 clinical signs of CCD are remembered by the DISHA acronym. Any 2 or more are a strong indicator.

• D - Disorientation. Gets stuck in corners, stares at walls, forgets the route to the door, gets lost in the house or garden, does not recognise familiar people or places.
• I - Interaction changes. Withdrawn, less interested in petting or play, more clingy, less responsive to cues, increased anxiety.
• S - Sleep-wake cycle. Sleeping more during the day, awake and restless at night ("sundowning"), pacing, barking at night, disturbed sleep.
• H - House soiling. Accidents indoors despite a lifetime of being clean. Forgetting the toilet cue, missing the door, soiling in the sleep area.
• A - Activity changes. Decreased interest in walks, repetitive behaviours (pacing, licking), less play, more rest.

The signs come on slowly. Owners often notice them in retrospect ("she was a bit off for months before we realised"). The diagnosis is by exclusion: a vet will rule out pain, infection, vision loss, and other conditions that can mimic CCD.

When to see the vet

See the vet within a week of noticing 2 or more DISHA signs. The vet will:

• Do a full physical and neurological exam.
• Run blood work to rule out metabolic causes (hypothyroidism, kidney disease).
• Assess pain (arthritis pain can mimic some CCD signs).
• Discuss the diagnosis and a care plan.

The diagnosis is not a single test. It is a clinical picture built from the signs, the blood work, and the exclusion of other causes.

Stages of progression

CCD progresses over months to years. A useful staging framework:

• Mild: one or two signs, slowly worsening. The dog still recognises family, still finds the food bowl, still does most of the usual routine. The owner often says "she's a bit off" without naming a specific issue.
• Moderate: three or four signs. The dog starts having night-time restlessness, more house soiling, less interest in walks. Quality of life is still acceptable with management.
• Severe: all five signs, with significant disorientation. The dog may no longer recognise family, may pace for hours, may have house soiling daily. Quality of life is the central question.

A mild-to-moderate dog with the right care plan has 1 to 2 years of good quality of life ahead. A severe dog with rapid progression is on the quality-of-life conversation within months.

At-home management

The 5 things that make the biggest difference at home.

1. Routine, routine, routine. A dog with CCD thrives on predictability. Same walk time. Same feed time. Same bedtime. Same person. Avoid rearranging the furniture; the dog navigates from memory, and a moved sofa breaks the mental map.

2. Night lights. A dog with CCD is more anxious in the dark. A low-wattage night light in the main living area, the hallway, and the toilet area helps. Many CCD dogs "sundown" (become more confused in the evening); the night light reduces the confusion.

3. Mental enrichment. Mental enrichment is just as important as physical comfort. Sniff walks, food puzzles, gentle training refresh, social contact. A bored CCD dog declines faster than an engaged one. See our enrichment guide and our separation anxiety guide (the techniques overlap).

4. Calming bed and pheromone support. A supportive orthopaedic bed and a dog-appeasing pheromone diffuser (such as Adaptil) reduce the night-time restlessness. See our orthopaedic beds guide and our anxious dog beds guide.

5. Vet-led medication. In some cases, the vet may prescribe a medication such as selegiline (Anipryl) to slow the progression. The evidence is mixed; the right answer for your dog depends on the individual case.

The quality-of-life conversation

The hardest part. Most owners of CCD dogs say the same thing in retrospect: they wish they had let go a day earlier, not a day later.

A useful quality-of-life scale is the HHHHHMM scale (Hurt, Hunger, Hydration, Hygiene, Happiness, Mobility, More good days than bad). Each is scored 1 to 10, with a total over 35 considered acceptable quality of life.

A few questions to ask the vet:

• "Is my dog in pain that we cannot control?"
• "Does my dog still recognise me and the family?"
• "Are there more good days than bad days?"
• "What does my dog's tail do when I come home?"

If the answer to 2 or more is "no" for more than a few weeks, the conversation about timing is on the table. Trust your vet, your family, and your own instinct.

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