Behavioral problems in dogs typically manifest as compulsive, disruptive or destructive behaviors. These can include incessant licking and chewing; drop in appetite; easily startled reactions; excessive tail chasing; inappropriate chewing and eating; excessive elimination; lethargy; obsessive-compulsive behavior such as endlessly chasing a toy or bird; poor housekeeping habits (such as not hiding all of their feces); and unrestrained aggression.