One of my yorkies go inside on newspaper and outside. My other one will only go outside. Always have the papers available, and take her out as you will. Praise her whenever she goes, and wherever she goes, unless it's on the carpet or somewhere else taboo. I always make a big deal out of pottying, giving them a treat and alot of hoopla. lol. If you catch them going in the wrong place, just whisk them to the right place. If you find out after the fact, there's not much you can do. Good luck!