I don't have a bunch of dog rimming experience but my pup now is pretty clean. Before rimming him I'll sniff his rear...if it smells bad we won't do itm.mif it smells good, not shitty, then I'll whipe his rear just to make sure it's clean....them I'll start rimming....we did last night. He enjoys it...laid on his side and was panting. When I'd push my tongue deeper he would move head to his read and lick my mouth as I rimmed him....he was getting himself use to the feeling since we just started doing this...then he would lay back down and turn on his back....I'd rim him a little more before licking his balls and sheath for him :3. My pup is 8m now....love the little things he is discovering sexually about himself.