Once a medical cause is ruled out or treated, primary behavioral disorders remain. Here, the veterinary scientist becomes a behavioral clinician, using evidence-based protocols.

| | Potential Medical Cause | | :--- | :--- | | House soiling in a trained cat | Lower urinary tract disease, chronic kidney disease, diabetes | | Nocturnal howling in an older dog | Canine Cognitive Dysfunction, pain, sensory decline | | Sudden aggression toward familiar people | Pain (e.g., dental, orthopedic), hypothyroidism, brain tumor | | Pica (eating non-food items) | Anemia, pancreatic insufficiency, GI disease | | Fly-snapping (biting at air) | Partial seizure disorder, GI discomfort |

A review of animal behavior and veterinary science reveals a high-stakes, intellectually demanding field that balances deep scientific knowledge with practical, hands-on care