I really feel your pain!! my 3 are 4.5, 4 and 3.5 yr olds and still potty inside the house. It just takes one to make a mistake and the other 2 will follow suit. I regularly have to revert back to basics and start all over again. It works for about 2 to 3 months and then one will have an accident and it's down hill from their on. I also have a doggy door, they will use it when we're there but will not be clean when we're not. I have tried diapers, belly bands, crates and go knows what else, but no use. They just refuse to stay potty trained. So I have restricted them to the kitchen (baby gates)
and have limited the clean up. yes yorkies are VERY HARD to train especially when they are hard headed...
