It was early in the morning as the Shepherd was cleaning it's butthole, lapping away the mess from the mess it made just a few minutes prior. A steaming pile of dog shit sat not too far away, quite a large pile that you helped release. It was day eight of being trapped as the dogs filthy, puckering anus and you weren't doing too hot.
Each day you spent passing by much the same, wake up, fighting to hold back the waste, but ultimately being forced open by your canine master. Forced to cough up those meaty turds you had building up in the back of your throat. After you finish up, being left with your mouth cloying with dog waste hoping they will lick you clean. Every dump you were forced to push out leaving lasting imprints on your psyche. The growing revolting enjoyment of it and the growing sick pride in how well you packed those turds. A pride and pleasure you grow to despise more than your function.
From their you would spend the day relatively uneventful, squeezing out gas quite often and feeling the tails fur bristle against your wrinkled form. You could hear it eating most the time, and occasionally be greeted by a nose, sniffing at you, some even giving a greeting lick. Then by the late afternoon you would do your function once again. This went by much the same day by day for the next week.
Each fart you burped up taking some memories, your past life blowing away with each noxious blast. It gradually became harder to recall your life before the zoo, before the genie. Your body becoming fuzzier to remember, your mental image of you fading in as a winking tailhole on the Shepherds butt. The thoughts terrified you. This was not how anyone should go, your family were surely looking for you, but what would they do if they found like this. What could they do? The thought of your family adopting a German Shepherd because their son was trapped as it's anus was dreadful.
You tried to hold onto your name at this point, but you couldn't full recall. You knew it started with an A but from there it was hazey.
You were pulled out of your thoughts as a meaty, FRRRRRnnnnttttt, gaped your lips leaving your scrambled mind with nothing to do but moan. God, you loved the feeling of a hot fart ripping from you. It always tasted and smelt just right.
Things were looking bleak~