Introduction: Steps Toward a Comparative Clinical Psychopharmacology /Dan J. Stein -- 1. Neurochemical Bases of Aggression / Klaus A. Miczek and Berend Oliver -- 2. Pharmacologic Treatment of Aggression in Veterinary Patients / Nicholas H. Dodman -- 3. Systemic Causes of Aggression and Their Treatment / Linda P. Aronson -- 4. Fear and Anxiety: Mechanisms, Models, and Molecules / Berend Oliver and Klaus A. Miczek -- 5. Pharmacologic Treatment of Fear and Anxiety in Animals / Petra A. Mertens and Nicholas H. Dodman -- 6. Pharmacologic Treatment of Phobias / Steven B. Thompson -- 7. Basic Mechanisms of Compulsive and Self-Injurious Behavior / Louis Shuster and Nicholas H. Dodman.