My eleven week old pup does it all the time, sometimes he just stands in the middle of the floor and does it to himself, quite amusing.

When he does it to me or anyone else for that matter I tell him no and he stops straight away. If he does it to himself or a toy I just leave him.

My last pups used to do it all the time too, and like the previous poster, one was female. She did it all he life to her brother. He was much bigger than her so she could only do it when he was lying down. He used to just stand up and walk off.

Adam