Xena hates yorkies ,we had one over back at last houe and girl was expecting she moved and sold house to parents but left her yorkie and her parents had one ,the yorkies did listen to them for anything and as soon as they were out they ran to back fence barking and winding up xena, xena ate through fence twice to try and get to them and when ever she hears a yorkie barking now she goes daft to try find it