Feline cognitive dysfunction syndrome (CDS) — the feline equivalent of Alzheimer's disease — affects a significant proportion of older cats and causes substantial suffering that is frequently unrecognised. Better awareness enables earlier diagnosis and management that can meaningfully improve quality of life.
Studies suggest 28% of cats aged 11–14 years and over 50% of cats aged 15+ years show signs consistent with CDS. However, owner recognition is poor — many signs are attributed to 'normal aging' rather than a diagnosable and manageable condition. The term DISHA summarises the primary sign categories: Disorientation, Interaction changes, Sleep-wake cycle changes, House-soiling, and Activity level changes.
CDS involves progressive neurodegeneration including: β-amyloid plaque accumulation (as in human Alzheimer's disease), cerebral vascular disease, oxidative stress, and inflammatory changes. These changes reduce synaptic density and neurotransmitter function, particularly in the prefrontal cortex and hippocampus, impairing memory, learning, and executive function.
Disorientation: Getting lost in familiar environments, appearing confused, staring at walls, walking in circles. Distressing for both cat and owner.
Interaction changes: Some cats become more clingy and vocalise excessively; others withdraw from social contact. Both reflect disrupted processing of familiar social relationships.
Sleep-wake cycle disruption: Increased nighttime activity and vocalisation, decreased daytime activity. Particularly distressing for owners and often the primary reason for veterinary presentation.
House-soiling: Urinating or defaecating outside the litter box due to forgetting its location or difficulty navigating to it. Causes owner frustration and risks the cat's welfare if it leads to punishment or rehoming.
Anxiety: Generalised anxiety is common, with startle responses, hiding, and inappropriate vocalisation reflecting a cat struggling to process its environment normally.
CDS is a diagnosis of exclusion — physical causes of each sign must be ruled out first. Hyperthyroidism causes hyperactivity and nighttime vocalisation; hypertension causes neurological signs; pain causes behaviour changes; urinary tract disease causes house-soiling; systemic illness causes withdrawal. Full geriatric workup (blood chemistry, urinalysis, thyroid, blood pressure, neurological examination) precedes a CDS diagnosis.
Dietary: Diets supplemented with antioxidants, omega-3 fatty acids, SAMe (S-adenosylmethionine), and medium-chain triglycerides have some evidence for slowing cognitive decline. Prescription senior diets for cognitive support are available.
Environmental: Maintaining predictable routines reduces anxiety. Night lights prevent disorientation in darkness. Additional litter boxes on every floor and close to sleeping areas reduce house-soiling. Comfortable, accessible resting areas minimise physical barriers to normal activity.
Pharmacological: Selegiline (licensed in dogs; used off-label in cats) inhibits MAO-B, increasing dopamine availability in the brain. Alpha-casozepine and L-theanine supplements reduce anxiety. Some cats benefit from anxiolytic medication for nighttime vocalisation.
Enrichment: Gentle mental stimulation (puzzle feeders, familiar scents, gentle interactive play) maintains cognitive engagement without overwhelming the cat's reduced processing capacity.
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