Roxie has a stuffed bear she humps. It's the only toy she has that she humps. I don't have the heart to take it away even though it's pretty grungy looking. My brother has 2 yorkie poo's and a small rescue dog. All 3 of them are males and fixed. They hump each other and sometimes have a train going with one on top of the other. It's pretty comical to say the least. It's definately normal and I agree with the dominence thing. I never thought a female dog would hump...but I guess I was wrong!
