It depends on the individual and your definition of a "good dog." Both labs and Pit bulls are high energy dogs, so expect a high energy dog. These breeds remain high energy for the majority of it's life. EXERCISE AND TRAINING are the keys. A tired dog, is a happy dog. This includes mental and physical stimulation. A bored dog will find a way to entertain itself whether you agree with the methods or not. It will most likely grow to be a fairly large and powerful dog, so training it not to jump on people and early leash training will help tremendously. Socialize it as much as possible; particularly if it is a puppy. This is CRUCIAL.