we got the doxie when he was a puppy and is now 2 years old. We got the 3 year old poodle mix and he would growl but never tried to bite her. He did the same thing with the shih Tzu only when we first got her. Our dogs are not crate trained. He is fine until our new dog tries to play with him. That's when he growls at her. We have to go out of town next week and are terrified of leaving them alone. We have had the 4 dogs for a year before we got our new one. I don't know if this has anything to with it or not.
It's been almost a week since we adopted our new dog and things seem to be working out. Our biggest problem was our doxie but he seems to have taken to her. Yesterday and today they have been playing together so we are hoping it will all work out.