In the normal course of operating my canine behavior practice in New York City, I will sometimes work with the family veterinarian and recommend that the veterinarian prescribe a pharmaceutical to assist me in modifying problem behavior exhibited by a family dog. A behavior problem is simply a behavior exhibited by the pet that the owner feels is inappropriate. A barking dog may be problem for an apartment dweller but not one for someone who lives on a farm.
Most behavior problems result from normal behavior typical of the species.
Examples of management problems are jumping on visitors, wild behavior or pulling on the leash. However, if your dogs steals a tissue and you approach him and grab it and he attempts to bite, that behavior can be defined as clinically abnormal. There's a lot you can tell about abnormal animals by the context that they do this behavior in. But if a human being walks in front of you while you are lying in front of a door and you reach up and sink your teeth into their groin, that's an abnormal behavior. And it's out of context.