In human medicine, a doctor asks, "Where does it hurt?" In veterinary science, the patient cannot speak. Instead, the animal presents a series of behaviors. For decades, these behaviors were often dismissed as "temperament" or "bad manners." A cat that hisses at the vet was labeled aggressive. A horse that weaves its head side-to-side was considered stubborn.
The American Veterinary Medical Association (AVMA) now recognizes that behavioral problems are a leading cause of euthanasia, surrender to shelters, and reduced quality of life in companion animals (AVMA, 2020). In production animals, abnormal behaviors (e.g., tail biting in pigs, feather pecking in poultry) directly correlate with poor welfare, reduced productivity, and increased disease transmission.
In veterinary science, behavior is the primary language of the patient. Because animals cannot verbalize pain or discomfort, their actions serve as clinical signs.
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