Yes, teacup yorkies bark a lot, especially around strangers. This tiny breed is very vocal, earning them a reputation of being “yappy.” This is mainly due to the little dog syndrome, where they think they’re bigger than they are.
As a result, teacup yorkies are very anxious and easily excitable. They won’t hesitate to bark at anything, from strangers and other dogs to unfamiliar noises.
With that said, you can train out their barking tendencies. Teacup yorkies are known to be harder to train than reguarly Yorkshire terriers, but with enough persistence, you can curb their bad barking habits.