Our female GSD Xena has started climbing on top of our neutered male Siberian Husky when he's laying down and lays on top of him like she thinks he's a pillow. Sometimes she sniffs his crotch. He growls at her and struggles until he gets away. I know she's not in heat because she went through her first heat 2 months ago. She didn't do this at all during her heat. It didn't start until over a month after. I'm just curious why is she suddenly treating our Husky like a pillow?