I had a GSD with a Yorkie and a Maltese. The GSD was an exceptional dog around the smaller dogs, I think she thought she was a little dog. But I never fully trusted her. Yorkies are too much 'in your face' when they want something, and they could care less, they would wrestle a dinosaur for a bone, lol.
So I never relaxed much until they were crated at bed time. There was only one fight, when my Yorkie decided he wanted to eat the big dog's food. She showed her teeth and growled at him, and started to open her mouth because he wouldn't get out of her bowl, by that time I got between them and no one got hurt. The thing is, her teeth are so big, even a gentle bite to the right area could punture a Yorkie's heart or lung.
When the GSD would play, she would smack her feet on the floor, but not when she played with the little dogs. But puppies will do this as will most big dogs. This action alone can break a Yorkie's neck or back if they happen to hit the Yorkie.
My larger Yorkie wounded my smaller Yorkie when he shoved his head in her mouth trying to attack her. He almost lost an eye, and she never even bit down.
Just saying, when you have two or more dogs, they need to be supervised when they're together. And may require additional training... |