Princess who is 1 yr is 100% using the litterbox. she is being trained to be a service dog. does anybody know how I can teach her to ONLY potty on a walk where I tell her she can go? she will go poop any ware while on a walk, even in the middle of a busy street. she refuses to go before we leave the house due to excitement of going to the pet store. I must get this under control so she dosnt go in stores when we get to that point. she MUST be fed every 6 hours, so I can't adjust her feeding times.