Nice job my little puppy, I'm impressed. Since you're a dog get on all fours. Turn around and show me your ass. Wiggle that smooth ass and bark for me. Good puppy. Now grab your ass cheeks and spread them I want to see your tight little hole. Before this is done that tight hole is going to be filled with all sorts of things and end up much looser. Why don't you lick a finger and play with that hole for a few minutes. Loosen it up a bit. You can use some spit if you need to. Play with that hole for a few minutes and bark as you do it.
You know what that asshole probably needs a good cleaning. Crawl to the bathroom and give yourself a couple of enemas. In fact make it three enemas. Make sure you hold those enemas in for a bit so you're totally clean. You'll thanks me later. I give you permission to empty yourself in your toilet. While you're there fill that cup with toilet water again and drink it. Make sure you leave the cup there. When you're done crawl back to me.