Our expert says:
If I were you I would have the male castrated as soon as possible and not wait until December. If the bitch is not spayed then I recommend you do this as well. If she has been on heat during the male's life then this will definitely have influenced his behaviour, which has turned into plain dominant bullying. She has become the "victim" and is probably gaining your attention from it.
Make a point of ignoring the fights completley, even walking out of the room. If thing get a bit nasty, you can intervene, but with as little interaction as possible. Don't make eye contact, shout, talk, cuddle or punish either of them, but calmly separate them for a few minutes, putting each in a different room with a chewy toy. (Imagine you are a machine, not a loving "mommy".) After a few minutes open the doors calmly and ignore them both again. They will soon learn that they can only play with each other when they are gentle. When you are out separate them if he bites her then.
Only pay them attention when one dog comes at a time and is calm. If the other one interrupts, then ignore both dogs and turn away. They will soon learn that they will only get your attention if they are calm and not competing with each other. Give them each a few minutes of complete focussed love and cuddles each day, perhaps grooming them or calmly massaging them. Especially work on building up the bitch's confidence by encouraging her and not by feeling sorry for her.
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