The goal of this issue is to make available the latest techniques and medications in the diagnosis and treatment of small animal behavior problems. Canine and feline behavioral problems continue to confound and intrigue practitioners, and this issue will address many topics that pet owners ask about. Chapters will include compulsive disorders, human directed aggression, house soiling and marking behaviors, and separation anxiety. Additional chapters will address genetics, dermatology, pharmacological support, dietary effects, and behavioral considerations in the management of working and performance dogs.