The intersection of behavior and veterinary science extends far beyond dogs and cats.

Equine practice: A horse that rears or bucks when saddled is often labeled "dangerous" or "dominant." However, equine veterinarians now routinely perform back examinations—palpation of the thoracolumbar fascia, thermal imaging, and even gastroscopy. Gastric ulcers affect up to 90% of performance horses and cause pain that is predictably triggered by girth tightening. Treat the ulcers, and the "bucking" stops.

Avian medicine: Parrots are prey animals who hide illness until near-death. A feather-plucking parrot is frequently prescribed an Elizabethan collar or behavioral enrichment. Yet a veterinary workup may reveal anything from heavy metal toxicity (zinc or lead) to a bacterial infection of the skin (staphylococcus) or a tumor of the uropygial gland. Behaviorists and avian vets now collaborate closely: no feather-destructive behavior is treated as "just behavioral" without a full medical board.

Exotic small mammals: Rabbits who suddenly stop using their litter box may seem "naughty," but this is often the first sign of subluxated lumbar vertebrae or bladder sludge—both painful conditions requiring radiographs and anti-inflammatories.

In every case, the protocol is the same: medical rule-out first, behavioral diagnosis second.

Abstract The integration of animal behavior (ethology) into veterinary science represents a paradigm shift in modern practice. Historically, veterinary medicine focused primarily on the physiological and pathological aspects of disease. However, a holistic approach now recognizes that behavior is a critical indicator of welfare, a determinant of physical health, and a primary cause of mortality in companion animals. This review explores the bidirectional relationship between behavior and medicine, the impact of stress on physiology, the challenges of pain assessment, and the necessity of low-stress handling techniques.

Chronic stress suppresses the immune system via glucocorticoids, making hospitalized patients more susceptible to nosocomial infections. It also delays wound healing and can lead to gastrointestinal distress (stress colitis), complicating the clinical picture.