That is a tough one because in all reality I suppose it couldbe done. But that being said, I just don't think there would be any way at all that I would leave it up to the mind of a tiny yorkie to be out in a yard on it's own without a fenced yard or a leash.... especially with a busy road. I mean they only have one chance to mess up. And not even saying anything about all of the thefts of yorkies.... you just never know what circumstances would make your yorkie bolt out into traffic... a cat... raccoon, kids.. etc.. I know they have "invisible" underground fences, but I am not sure if they work by shock or what they do.. It may just be RF signals.. You might look into that.. Even then, I don't know if I personally could feel comfortable with it.
Sonya |