Diagnosis of Canine Cognitive Dysfunction Syndrome: A Narrative Review

Many recent progresses in the overall quality of life have allowed for an increase in life expectancy, both in humans and in dogs. In addition, long-lived individuals may develop neurodegenerative disorders, and one of the most important in human medicine is Alzheimer's disease (AD). In veterinary medicine, the AD counterpart is Canine Cognitive Dysfunction Syndrome (CCDS), which, generally, affects elderly dogs from 8 years of age. These cognitive disorders are becoming frequently encountered conditions and, despite researchers' attention towards pathogenesis, treatment and diagnosis, more efforts are required to outline which clinical and laboratory evaluations must be carried out to reach a presumptive antemortem diagnosis of CCDS. The biggest need is the establishment of standardized protocols and guidelines for a correct clinical and diagnostic approach towards dogs with clinical signs referrable to CCDS. In this narrative review, we examined the up-to-date scientific literature on the topic, focusing our attention on sensitive and reliable markers for clinical antemortem CCDS diagnosis. Even if some parameters analyzed are interesting and promising, more investigations are needed to confirm the results obtained so far. This is crucial because a correct diagnosis is fundamental to determine the best treatment and, thus, to guarantee animals' health and welfare.