| Medical Condition | Behavioral Sign | |-------------------|------------------| | Hyperthyroidism (cats) | Increased vocalization, restlessness, aggression | | Urinary tract infection | Inappropriate elimination (house-soiling) | | Seizure disorders (partial/focal) | Fly-biting, sudden aggression, staring | | Osteoarthritis | Reduced activity, irritability, sleep disruption |

Physical exam, orthopedic evaluation, and bloodwork reveal severe hip dysplasia and mild cognitive dysfunction syndrome.

The dog’s aggression is pain-induced (guarding its own body to avoid painful movement) plus fear from cognitive decline.

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