Dogs bite their own owner over no respect, fear, aggression, etc. When I had to do certain training I left a leash on the dog in the house to grab them quickly if I needed too, and directed the behavior I wanted, not always with treats or affection that came later. Do not strike a dog with your hand ok, I might hold their mouth closed over certain things. Do you know how dogs react to other dogs? If you can stand over top of your dog that is a big accomplishment. There was these people one time that had a blue heeler that would only let certain people do things in their house.