Ok so I have a male gsd of course ,and my girlfriend has a boxer female ,every time we put a toy down even two for each ,the boxer goes at my gsd he runs away or try's anyway tell she won't leave him alone then he gets mad and they go at it every time is the same he wins and walks away but then she goes back at him again and he puts her down again it's getting to the point were she is getting hurt but she just won't leave him alone and now it's starting to happen anytime even when there is nothing going on ,what can I do to make her stop so he does not hurt her anymore??? I understand they have to set rules for each other and set who is boss and all but it's getting to bad I don't want them hurt...
Here's what I am reading, you have two dogs, both top dogs in their respective households, perhaps coddled and spoiled a bit - it happens in the best households, putting them together with resources - something they have never shared before and expecting them to share. It will not happen naturally. Not without vigilance on the part of the humans and possible bloodshed on the part of the dogs.
Dogs should work it out, but sometimes they cannot. You have to teach them. Keep them separate, establish for them a pecking order. One dog always receives it's toy first, always receives it's treat first. You or your gf are the leader, you determine which dog is Gamma, you or gf are alpha, next human is beta and then which dog is Gamma. When thedogs cannot do it, we do it. Beyond that, rotate until they can or will learn, young dogs with much older dogs always requires human intervention, same aged dogs, they just need guidance.