Before hiring a trainer for a sudden behavior change, visit a veterinarian. A blood panel or a physical exam might reveal the root cause.
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Traditionally, veterinary curricula focused heavily on pathology, pharmacology, and surgery. Behavior was often an elective—a "soft science" compared to the rigidity of biochemistry. Consequently, many practicing vets fell into the trap of the medical model : presenting a symptom, prescribing a pill. Before hiring a trainer for a sudden behavior