I like that you actually put some thought into this. The shit wouldn’t be invisible, so you would have to train it like any other dog, I guess. The invisible dog might be a bit tough to train, but it could be worth it considering all the cool stuff it can do, such as: fuck up intruders and your enemies ninja-style, steal stuff for you or carry out other stealth missions like shitting on someone else’s carpet. It can even join you where dogs are not allowed so you can cuddle with it anywhere!