I've had raccoons pooping in my pool some years ago; on the steps. Yuck - what a job to clean up. I understand they don't have salivary glands and so they like to dunk their food in an water available. Probably that's what it was doing and figured that while it was dunking it might as well be pooping too ! I haven't had one around for a few years now. Possums now and then I still get.
