When environmental modifications and training aren't enough, veterinary science turns to behavioral pharmacology. Anti-anxiety medications or antidepressants are often used to "lower the ceiling" of an animal's reactivity. This doesn't drug the animal into submission; rather, it stabilizes their brain chemistry so they are capable of learning new, positive associations.
A 4-year-old Labrador retriever presented for "unprovoked biting" of children. Neurological exam was normal. Behavioral history revealed the dog only snapped when touched on the left flank while lying down. Radiographs identified severe hip dysplasia on the left side. Treatment of the pain eliminated the aggressive displays. Without behavioral analysis, this case might have been misdiagnosed as idiopathic aggression leading to euthanasia (Overall, 2013). zooskool stray x dog
| | Behavioral Change | Underlying Disease | Mechanism | | :--- | :--- | :--- | :--- | | Canine | Sudden aggression towards familiar people | Pain (e.g., dental, orthopedic) or hypothyroidism | Nociception lowers aggression threshold; hormone imbalance alters fear response | | Feline | Hiding + decreased play | Chronic kidney disease or osteoarthritis | Energy conservation; avoidance of vulnerability | | Equine | Head pressing or circling | Hepatic encephalopathy or brain tumor | Metabolic toxin effect on limbic system | | Bovine | Reluctance to rise + isolation | Lameness or acute mastitis | Pain-induced immobility; social separation as sickness behavior | Radiographs identified severe hip dysplasia on the left side