[Michael Romanos]

Well there are always going to be exceptions. Dogs can easily get "bound' up by either holding back pooping - usually from being confined - or from continuously having hard food/ having fragments of bone etc caught in their internals. But I would still find it hard to believe that a dog won't urinate just a little as a mark of territory if not to relieve himself/herself whilst out on a short/long walk in areas where other dogs have passed by.

Your rescue dog story is the exact opposite to all the Corgis I've ever had. None of them have ever pooped on their property from the time they were six months old.