My Border Collie used to have an 'invisible fence' in a previous yard before I got her. They do get zapped with an electric current...it can be made weaker or stronger. She learned pretty quickly NOT to cross over it because she would get a warning beep within so many feet of the wire...and then a zap once she crossed over. I don't think that would be good for Yorkies. AND, once they cross over...they're free to roam!! Also, the batteries on the collar wear out and have to be checked. AND, it does NOT stop animals from coming into the yard unless they are wearing a shock collar themselves. I think it would be a better idea to get an actual fence. |