I can't imagine ANYONE that had a yorkie at any age that didn't have the occasional accident
We pee pee pad trained our pups and they (all six) did awesome..but did they hit it every single time...NO. The two we kept are about eight months old now and they still have accidents so we are trying the belly bands (plus we just had the carpets cleaned) while we are training them to go outside. Bitsy was trained really well when we got her at three years of age and Bentley we got as a pup and he wasn't trained really well until almost a year old.