Which of the following is NOT among the top 10 canine conditions with environmental components?

• A. Arthritis
• B. Hypothyroidism
• C. Eye infection
• D. Obesity

Answer: (D)

The main idea here is how external exposures in a dog’s environment contribute to disease risk. Environmental factors include irritants, allergens, pathogens, toxins, or conditions that people can modify to reduce risk.

Eye infections are often linked to environmental irritants or pathogens present in dirt, dust, and shared living spaces, so they rank high as conditions with environmental components. Arthritis is influenced by the environment as well—excess body weight and limited physical activity, both shaped by a dog’s daily environment and lifestyle, can worsen joint disease. Hypothyroidism can also be influenced by environmental factors such as certain toxins or dietary components that affect thyroid function, so it appears on the list too.

Obesity, while tightly connected to diet and activity which are shaped by environment, is primarily a metabolic and lifestyle condition rather than a direct environmental exposure. Because of that distinction, it isn’t counted among the top conditions defined by environmental exposures, which is why it isn’t on that environmental-components list.

In short, obesity is driven by energy balance and behavior, whereas the others involve direct environmental exposures or interactions that elevate disease risk.