Which of the following can indicate that an animal is unhealthy?

The presence of a runny nose and cold ears can indeed indicate that an animal is unhealthy. These symptoms may suggest respiratory infections or other illnesses affecting the animal. A runny nose often points towards conditions such as a cold or allergies, while cold ears can indicate poor circulation or fever, signifying an underlying health issue. Together, these signs are commonly associated with illness and warrant further examination by a veterinarian to determine the specific health concerns.

In contrast, high social interaction, clean ears and nose, and bright, alert behavior generally suggest that an animal is healthy. High social interaction reflects good mental health and well-being. Clean ears and nose indicate that the animal is being properly cared for and is likely healthy, as dirt or discharge in these areas can be a sign of health problems. Bright, alert behavior signifies an animal's responsiveness and overall good health, as lethargy or dullness may indicate various health issues.