It's really funny, but Lily is doing that all the time now. She would turn her butt to a wall or an object, lifts her tail and quivers. She's doing it when she's getting excited - when I'm about to give her a treat - or when I want to take her away from a place where she's not supposed to be. Remember, she's female AND spayed !
So far, I did not notice something coming out of her when doing that, but sometimes you can see the muscles in her belly contracting while quivering, just as if she's pressing. Strange, isn't it?
Kirsten
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