Just like humans, an animal’s physical health is deeply tied to their mental state. A cat that stops using the litter box might not be "acting out"; they might have a urinary tract infection. Conversely, a dog with chronic anxiety may develop a weakened immune system or digestive issues.
Perhaps the greatest practical application of this field is the certification movement. Recognizing that a terrified patient provides poor data (e.g., a stressed cat has elevated blood glucose and blood pressure, mimicking diabetes), clinics now implement: Zoofilia Perro Abotonado Y Acabando En Mujer Rar