Chew's new trick

So, my old dog Chew has a new trick. Because it rains a lot in Portland, I have two pretty nice dog houses for my dogs, since, in theory, they would spend quite a bit of time in them staying dry. Of course, Ben prefers to sleep in the mud. However, Chew is prissy for a dog and hates mud. He usually finds a nice dry spot or sleeps in one of the dog houses. Unfortunately, his new trick is that he poops in the dog house, and then, since he's so prissy, he won't go back in it and sleeps in the rain. I, of course, clean it up the next day, and the cycle begins again. This has been going on for a few days now. I wish that when he did it, he would figure out that he could go into the other perfectly good dog house that is not pooped in. Sigh.