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Behavior is often the first indicator of an animal’s physical and emotional state. Many “behavioral problems” have underlying medical causes. Conversely, chronic stress or abnormal behavior can lead to physical illness. Integrating behavior into veterinary practice improves diagnosis, treatment, and animal welfare.

| Behavior Change | Possible Medical Conditions | |----------------|----------------------------| | Sudden aggression | Pain (arthritis, dental), brain tumor, rabies, hyperthyroidism (cats), hypoglycemia | | House soiling (cats/dogs) | UTI, kidney disease, diabetes, inflammatory bowel disease, cognitive dysfunction | | Increased vocalization | Deafness, sensory decline, hyperthyroidism, hypertension, pain, anxiety | | Lethargy/depression | Infection, anemia, organ failure, chronic pain, hypothyroidism | | Repetitive behaviors (tail chasing, flank sucking) | Neurological disorders, GI issues, skin allergies, compulsive disorder | | Night waking | Cognitive dysfunction syndrome (senior pets), pain, medication side effects |

Veterinary science is a broad medical field focused on the of disease in animals.