How does aging affect a dog's risk for subclinical disease?

• A. Aging decreases the risk of subclinical disease.
• B. Aging has no effect on subclinical disease risk.
• C. Aging increases the risk of subclinical disease.
• D. Aging cures subclinical disease.

Answer: (C)

Aging reduces a dog’s physiological reserve, so diseases can accumulate and progress without obvious symptoms. As organs age, their function declines and the body’s ability to compensate for early damage wanes, meaning subclinical disease—present but not yet producing noticeable signs—is more common in seniors. Regular wellness screening in older dogs is crucial because many conditions show up first on tests (blood work, urine analysis, imaging) before any outward signs appear. Examples include early kidney disease, heart changes, and some endocrine disorders that can lurk quietly for years. Because aging doesn’t eliminate disease and often precedes symptom development, the overall risk of subclinical disease increases with age.