Which of the following is NOT among the five most common senior dog diseases identified in primary care service?

• A. Dental disease
• B. Osteoarthritis
• C. Cancer
• D. Cognitive dysfunction

Answer: (C)

The main idea here is that in primary care for senior dogs, the most frequent concerns are chronic, non-neoplastic conditions that affect daily function. Dental disease is extremely common in aging dogs and often causes pain, reduced appetite, and systemic effects if untreated, so it routinely features as a top senior-dog issue in general practice. Osteoarthritis is another widespread problem: aging joints lead to stiffness, limp, and decreased activity, which owners bring in for management. Cognitive dysfunction is increasingly recognized as a common aging change, with signs like disorientation, altered sleep patterns, and behavioral changes that prompt veterinary attention. Cancer, while serious and important, does not typically rank among the five most common presenting diseases in a general senior-dog population seen in primary care; it tends to be identified less frequently as a primary reason for visits compared with these chronic conditions, though it remains a critical area for screening and follow-up.