What is a common sign that an animal may be diseased?

A common sign that an animal may be diseased is the presence of signs of distress, such as limping or coughing. These symptoms can indicate underlying health issues or illnesses. For example, limping might suggest an injury or pain, which could stem from a variety of diseases or conditions affecting the joints, bones, or muscles. Coughing can also be symptomatic of respiratory diseases or infections, signaling that the animal's health is compromised.

While excessive barking may indicate stress, anxiety, or a response to external stimuli, it does not directly signify illness. Similarly, running away from people could represent fear or aggression rather than any specific health concern. Eating excessively can sometimes be associated with certain conditions, but it is generally not a reliable indicator of disease. Therefore, the presence of clear signs of distress is a more direct and concerning indicator of potential health problems that necessitate further investigation and potential intervention.