Cognitive Aging in Canine and Feline Systems

Cognitive aging in domestic dogs and cats encompasses a spectrum of behavioural, anatomical and molecular changes that parallel key aspects of human brain senescence. In both species, advanced age is accompanied by declines in learning, memory, social engagement and environmental exploration, underpinned by neuronal loss, synaptic alterations and the accumulation of misfolded proteins. Companion animals naturally develop amyloid‐β deposits and, in some cases, tau pathology, offering a valuable comparative framework for human neurodegenerative research. The field embraces a One Health perspective, recognising that insights into animal brain ageing can inform veterinary care and accelerate therapeutic strategies for human dementia. Practical applications extend from diagnostic biomarkers in blood to targeted lifestyle and nutritional interventions, with implications for improving quality of life in ageing pets and their owners worldwide.

Research from Nature Portfolio

Recent studies have demonstrated that companion animals furnish robust models for translational insights into age‐related neurodegeneration. In one investigation, researchers contrasted canine activity patterns with fractional lifespan, working memory and gait speed, revealing that lower daytime activity and reduced on‐leash gait speed were predictive of cognitive impairment. These findings underscore the potential of wearable activity monitors to detect early behavioural markers and motivate interventions. Another study adopted a comparative biology approach to Alzheimer-like pathology, showing that both cats and dogs exhibit brain atrophy, extracellular amyloid plaques, neurofibrillary tau tangles and associated cognitive decline. By mapping shared molecular signatures across species, this work reinforces the value of natural companion animal models in elucidating disease mechanisms and guiding novel therapeutic targets.

Cognitive Aging in Canine and Feline Systems publication trend

The graph below shows the total number of articles in cognitive aging in canine and feline systems across all publications each year (not limited to Nature Index journals).

Technical terms

Canine Cognitive Dysfunction Syndrome (CCDS): A progressive neurodegenerative disorder in ageing dogs characterised by disorientation, altered social interactions and memory deficits.

Amyloid‐β (Aβ) plaques: Aggregated extracellular protein deposits formed by misfolded Aβ peptides, implicated in synaptic dysfunction and neurotoxicity.

Neurofibrillary tangles (NFT): Intracellular aggregates of hyperphosphorylated tau protein that disrupt neuronal transport and contribute to cell death.

Neophilia: The behavioural tendency to explore novel objects or environments, often reduced in cognitive decline.

Neurofilament light chain (NfL): A cytoskeletal protein released into blood and cerebrospinal fluid upon neuronal damage, used as a biomarker of neurodegeneration.

Fractional lifespan: The proportion of an animal’s expected lifespan reached at the time of assessment, used to normalise age-related measures across breeds and species.

References

1. Activity patterns are associated with fractional lifespan, memory, and gait speed in aged dogs. Scientific Reports (2023).
2. Going beyond established model systems of Alzheimer’s disease: companion animals provide novel insights into the neurobiology of aging. Communications Biology (2023).
3. The behavioural effect of short-term cognitive and physical intervention therapies in old dogs. GeroScience (2024).
4. Plasma Neurofilament Light Chains as Blood-Based Biomarkers for Early Diagnosis of Canine Cognitive Dysfunction Syndrome. International Journal of Molecular Sciences (2023).
5. The domestic cat as a natural animal model of Alzheimer’s disease. Acta Neuropathologica Communications (2015).