This picture looks very familiar to me. That's because I did this exact same thing when I was a kid. I drew all over the hallway walls while my dog watched helplessly. When my parents found out they asked me what happened so I told them that the dog put the crayon in his mouth and started to draw. I then acted out how the dog would have done it. They asked, "why is there crayon all over your mouth as if you were the one who drew all over the wall using your mouth instead of your hand?" I didn't have a good answer for that. Just like that, I was grounded, though that's only because I was so young that I was pretty much always grounded.
That poor dog. He knew he was going to get blamed. Not only did he get assaulted, he got blamed too.