One thing that can work to teach your biter to be less reactive to your other dog is to work with each of them separately to train them in basic obedience until each is very good at sitting, lying down, staying, coming, stopping, quieting after barking, etc.
Put them both beside each other in down stays and treat, praise one as the other stays put. You might have to have one dog in a wire crate to start to achieve this. But the idea is that you train your biter to eventually learn to sit, lie and stay still while your other dog gets attention, gets up and walks around and gets treats from you. If you do this gradually and in slow sessions, it could work to train your biter to the other dog having the right to be active, playful, eat and move about at all times. When it is working indoors, move the training outside where the trouble usually begins. Keep your biter in the down stay as you run about and so forth with the other dog. This is teaching your biter that the other dog has his rights to frolic and do things outdoors, encroach on potty and urination sites, and that you are endorsing it. Treat and praise your biter profusely for each time that he restrains himself and his impulse to arise and get involved or discipline or correct.
Teach your biter the "Leave it!" and when you see him alerting to the other dog with perked forward ears, intense gazing, extremely up-cocked or slowly wagging tail, fixated stalking toward him, possibly one foot raised as a bird-dog does, say "Leave it!" and reward him for breaking off his alert. And separate the two more and keep showing your dog a fist closed around your ever-present treat, getting him to focus on that. Throw a stick for him to chase or a ball. Get him actively doing something other than thinking of the other dog.
Again, this likely won't work all that well unless you are a quite strong dog leader and excellent trainer if both are alpha males and each insisting on leading the pack and even then with certain little dogs of the same sex, you still have to always be vigilant when they are together.
__________________ Jeanie and Tibbe One must do the best one can. You may get some marks for a very imperfect answer: you will certainly get none for leaving the question alone. C. S. Lewis |