Surely this can't be sooo uncommon, but my pup, Opal backs up all the time to poo. It's like she loves leaving turds on fences and walls everywhere. You're not alone.She also pooped an entire turd ON the wall. It looked like she had backed right up and pooped. It is a shame I lost the photo. We took a picture of it and photo shopped it to look like a framed painting on our wall.