This can be a very natural behavior, spay or not. Often just normal *dog* behavior and there still may be some hormones causing this behavior. She may grow out of it and she may not. There might be a *slight* chance of a hormone imbalance and possibly getting the thyroid checked might be a possibility. My daughter has a little, spay Chi mix who is over 3 now and she still humps her other spay female dog, esp when she gets excited, playing, etc. I've read it is to show dominance but I don't know that I agree with that theory. Actually, she usually humps her head. :-) You might try distracting her with a toy or something when she does this or give her a firm *NO* of *OFF*. You can try the ole squirt bottle of water routine.
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