I agree that taking them outside every two hours or so is very important until they catch on. But what I find works is if they don't go potty when outside, put in crate when you get back in if the dog doesn't go. Then in about a half hour, try again. Each time the dog goes, praise and give a treat. If it doesn't go, don't yell at it just put it back in the crate instead of letting run in the house. Yorkie's are pretty smart and social. They catch on pretty quick if they want to have fun outside the crate, they need to go when outside. But you have to be consistent in doing this and take out at the same place each time as well.
