Which of the following is one symptom of rabies in animals?

Excessive salivation is a well-known symptom of rabies in animals. This is caused by difficulty in swallowing due to the paralysis of the throat muscles and the increased production of saliva, which is characteristic of the disease. Animals with rabies often exhibit this behavior as the virus affects their nervous system, leading to altered behaviors and physical symptoms.

While loss of appetite, severe weight loss, and joint pain may occur for various reasons in animals, they are not classic symptoms associated with rabies. Loss of appetite can be indicative of numerous health issues, and severe weight loss might occur as a consequence of prolonged illness or other conditions. Joint pain is commonly associated with arthritis or other skeletal issues, but does not relate directly to rabies. Excessive salivation stands out as a specific clinical manifestation of rabies.