We have two young Basenjis {female: age 3.5 and male: 1.5} and one 14 yr old Golden Retriever mix.
Jazz, the B-female, is really snotty with Gypsy, the GRmix, and is getting worse as Gypsy ages – actually started getting worse once the little B-boy moved in.
He is very aggressive in his play/actions with Jazz, often grabbing her neck so hard and dragging her to the point where she cries out and he won't let go until we make him.
Before he moved in, she was very much the alpha dog between her and Gypsy. Gypsy never cared who was top dog, so it worked out well with the two females getting along fine and there was peace in the house most of the time.
Once Keoki moved in and started pushing Jazz around, she seems to have reacted by being more assertive in her position over Gypsy.
Also, Gypsy is definitely showing signs of aging -- hips giving out, stumbling a bit, etc -- and the more problems she has, the more snippy Jazzy gets with her. I think, as with nomrbddgs. she recognizes Gypsy's weakness and is taking advantage of it {Not that it's necessary because Gypsy doesn't care or ever try to be any kind of top dog}.
It's hard to watch and kind of pisses me off sometimes -- Gypsy is the queen, you know! -- but I figure it will happen until G passes away.
There's never any blood drawn though, just loud and vicious sounding growls whenever Gypsy does any thing at all, including dare to enter a room!