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Introduction Traditionally, veterinary science focused primarily on pathophysiology, pharmacology, and surgery. However, over the last two decades, a paradigm shift has occurred: behavior is now recognized as the fifth vital sign (alongside temperature, pulse, respiration, and pain). Understanding animal behavior is no longer an elective specialization but a core competency for modern veterinary practice. It influences everything from the accuracy of a diagnosis to the safety of the clinical team and the success of treatment compliance. 1. Behavior as a Diagnostic Tool Animals cannot verbally describe their symptoms. Instead, they communicate illness through behavioral changes . A cat hiding in the back of a cage is not necessarily "aggressive"; it may be experiencing severe nausea or hyperthyroidism. A dog that suddenly growls when touched may have orthopedic pain, not a temperament problem.