Which of the following is a sign of a healthy animal?

A sign of a healthy animal is characterized by clear eyes, a shiny coat, and normal eating and drinking habits. Clear eyes indicate that the animal is well-hydrated and free from infections or diseases that may cause cloudiness or discharge. A shiny coat is often a reflection of good nutrition and overall health, as the condition of an animal’s skin and fur can signify how well its diet supports its wellbeing. Normal eating and drinking habits are fundamental indicators of health; changes in these behaviors can often suggest underlying health issues.

Other signs mentioned, such as pale eyes and a rough coat, suggest potential health problems. Likewise, excessive weight loss and lethargy indicate serious concerns regarding the animal's health status, as they can be symptoms of underlying diseases or conditions. Persistent coughing and sneezing may signal respiratory issues or infections. Therefore, the first choice embodies the positive attributes associated with a healthy animal, while the others reflect various signs of health deterioration.