Serotonin or dopamine deficiencies.

To give your paper academic weight, incorporate these foundational concepts:

The fields of and veterinary science are deeply intertwined, as behavioral changes are often the first outward sign of an underlying medical condition . While animal science focuses on the biological and environmental factors influencing an animal's life (genetics, nutrition, and behavior), veterinary science prioritizes the diagnosis and treatment of diseases and injuries . The Connection Between Behavior and Health