Mine used to do it to the mailman or anyone at our door they would dart out the door and do it before I could stop them and I hated it. It was embarassing and as they got older they stopped doing it and I was glad. So even though you think its cute and no harm I wouldnt let her get away with doing it because you dont want her doing it to other people. Yorkies are known as yappers and ankle biters anyway it doesnt give them a good name |