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Life sciences · Journal article
Obm Neurobiology · November 5, 2026
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Canine Cognitive Dysfunction (CCD) is a naturally occurring neurodegenerative syndrome of aging dogs that shares important clinical, neuropathological, and molecular characteristics with Alzheimer’s disease. Consequently, domestic dogs have become one of the most informative comparative models for investigating mechanisms of human cognitive aging and neurodegeneration. Surprisingly, far less attention has been devoted to their closest living relative, the gray wolf (Canis lupus), despite the unique evolutionary perspective that this species offers. Here, we propose the hypothesis that domestication has modified the environmental determinants of neural resilience by altering the lifelong ecological conditions and patterns of ecological exposure experienced by the canine brain. Rather than suggesting that wolves are intrinsically protected against neurodegeneration, we propose that wolves and domestic dogs may follow different trajectories of brain aging because of long-term differences in physical activity, cognitive demands, social organization, metabolic regulation, and environmental predictability. Current evidence is indirect but biologically coherent. Nevertheless, converging observations from comparative neurobiology, veterinary neurology, environmental enrichment, cognitive reserve theory, and evolutionary medicine provide a biologically plausible framework for its formulation. We integrate these independent lines of evidence into a conceptual model linking domestication, lifelong environmental complexity, neural resilience, and cognitive aging. The hypothesis generates explicit and experimentally testable predictions involving comparative behavioral studies, neuropathology, biomarkers, neuroimaging, and One Health approaches. If supported, this framework would expand the current understanding of domestication beyond its recognized effects on morphology and behavior, identifying it as a potential evolutionary modifier of brain aging. Comparative investigation of wolves and domestic dogs may therefore provide novel insights into the mechanisms governing neural resilience and age-related neurodegeneration across mammalian species, including humans.