Smoky is very good at walking on his leash when we go out for long walks. But I'm now trying to train him to go out to potty on his leash. When we get outside, he simply walks circles around me, we can stand there 30 minutes, and he just walks circles. It is the usual time I take him out, say the same "code" words, the only think different is the leash. We have a big yard, and I normally let him run lose to potty, but I have a babysitter coming to stay with him while I'm on vacation next month, and I can't figure out how to get him to potty while one the leash? Any tips would be great, thanks so much!