Sudden aggression is frequently triggered by pain. Dental disease, spinal injuries, and ear infections can make an animal lash out when touched.

Behavioral research has shown that barren environments lead to stress, which leads to immunosuppression, which leads to disease. Swine veterinarians now recommend rooting materials (straw, ropes) to reduce tail biting—a behavior that creates open wounds and leads to devastating infections like Streptococcus suis. By fixing the behavior, they fix the medical problem.

A veterinary treatment plan fails if the owner cannot implement it due to the animal’s behavior.

One of the most critical principles of veterinary behavior science is that sudden behavioral changes are often the first sign of physical illness or pain. Animals cannot speak; they communicate discomfort through actions. 1. Pain-Induced Aggression

Current veterinary curricula devote less than 5% of contact hours to animal behavior (Patronek & Dodman, 2019). This gap leaves practitioners ill-equipped to differentiate medical from behavioral etiologies, leading to overprescription of psychoactive medications or, conversely, referral to unqualified trainers who may use aversive methods. The One Welfare framework—extending One Health to include psychological well-being—demands that veterinarians become competent in basic behavioral medicine.