My long-spayed female dog will do this occasionally if she really thinks she's losing. She's done worse things to get the upper hand (she doesn't like other dogs unless she can boss them around).

She's about 35 pounds and retirement-age (12 years old now) but spry. A few years ago we had a young, hyperactive, rescue dog that was probably some combination of Cardigan, blue heeler, and pit bull--short but beefy and with huge mule ears (weighed about 50 pounds when he was healthy again). She played him like a fiddle. He almost literally couldn't make a move unless she let him. One day, though, he got too pushy and she deliberately peed in his food bowl to get even.

We call her our "white trash dog"--she's white and she has absolutely no class.



Our first dog humped a lot when you tried to play with him, but he was a male (neutered) with a serious alpha complex so that wasn't surprising.