Seek professional help. Take him to a trainer or behaviorist or better yet, have them come to your home to see him in action. I have to disagree with another post, biting and drawing blood is not normal or healthy behavior. You should be able to take anything from your dog anywhere and anytime without being harmed.
Recommended to me for my aggressive pup:
-Remove toys, objects that trigger, eventually can be reintroduced when he has improved.
-Time-outs, nips or bites, play time is over, meal time is over, but no longer than 5 minute time-out, dogs have 90 sec memories. Also, time-out should not be in his crate or play area. Designate a spot for this.
-Use a direct tone, not angry, or loud
Again, the above worked well for my very young pup, not to sure with a mature dog.
Best of luck |