When your dog attacks someone , poor training or lack of play maybe part. 1.) get a spray bottle, use it every time your animals is preparing to do something you don't want them to do. 2.) if your animal is attacking other animals or people. Its time for a Shock/Training collar. These work great. Sometimes animals cannot be broken of this trait, and have to be euthanized 3.) walk your dog and play with your dog to wear off energy.
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Keep him on a leash when you go for walks. If you have trouble controlling him, use a choker chain. They may seem rough, but seeing that you are not actively choking the dog, it is rather up to him. If he pulls hard, it tightens. When he realizes he is uncomfortable, he backs up so it loosens. He will come to learn that walking with you is comfortable, and snatching you around is not. Not only that, but you need to have control of your animal at all times, especially if he is showing aggression. Chances are, he needs other training as well. Your dog is probably showing other signs of behavior issues that you may or may not of have picked up on. You should pick up a couple of books on training, and read up. One form of training links into others ways that you would never expect.
If the rabbit is a pet, make sure you keep it safe while the dog is training. They can be easily hurt, and you are responsible for what your dog does as well as the safety of those exposed to it.