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Animals cannot verbalize their symptoms. They cannot tell a veterinarian, "My stomach hurts" or "I am feeling anxious." Instead, they communicate through posture, vocalization, and changes in routine. For the modern veterinarian, behavioral observation is the primary diagnostic tool. Changes in behavior—such as a normally social dog hiding in a corner, or a prey animal like a rabbit sitting hunched and still—are often the first, and sometimes only, indicators of pain or illness.