Rex does this with 1 dog and thats it...and the oddest thing is that this dog is a lab, this dog is a BOY too, andd...Rex is neutered. this is his 2nd time there, the 1st time he wasnt neutered so we just let it go, but this time he was and my mom and i tried to get him to stop but he wouldnt. we were sooo embarassed so we just tried to laugh it off
