We bought a 7 month old yorkie from a breeder who allowed the puppy to potty in its kennel. Our dog is now 14 months old and he still has daily accidents in the house. We keep him contained in the kitchen which has a tile floor. We would like to get rid of the baby gates but he can't be trusted not to go to the bathroom on the carpets. We have successfully trained our other dog but our yorkie doesn't seem to cooperate. Any suggestions, please.