Alot of Yorkie dislike the cold temperatures. Luckily, Finnigan will do his business outside really fast and then run back in. The first winter we'd really have to stay outside for awhile before he'd go in the cold, but I didn't want him to get used to getting his way of not going outside. We crate trained him so if he wouldn't go potty outside when we took him he went back into his crate and if he did potty he got to play outside his crate for 15-30 min.
Is it the litter part of indoor training you dislike or just the going inside part? Alot of members use puppy pads inside. I've heard mixed things about litter box training. IMO its too messy!
Good luck!
__________________ Jenni Finnigan  & Gwenndilyn 
Forever in my heart |