My dog won't stop trying to eat my poop?

Whenever I go "number two" my dog always knows, and even if I lock the door he flings himself against it until the locks can't hold anymore. Although I'm sitting on the toilet he uses all his force and thrusts his head inside, slurping and loudly gulping down dirty water and scraps of my poop. The worst part is if I stand up he slaps his slimy tongue right inside my anus and starts licks up whatever is left over. It really hurts because my bum hair gets stuck inside his teeth. What should I do?
 
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