Maybe this is a silly question but I'm still trying to learn my new piggies' behavior. During floor time (and only floor time) if one of my girls pees, the other one will sniff the pee, lick it, and then sniff the butt of she who peed. Is this normal? Or healthy? Is it a dominance thing? I'm trying not to worry myself over it but I've never seen another animal do this! (besides dogs, of course)