When we go on Vacation usually my parents watch our dogs. My Dogs love my parents and go crazy when you say 'Do you wanna go to Grandma's". If my parents can't watch the dogs, they go with us.   
If I HAD to use a pet sitter I would ask for references (ask them for a reference from another Yorkie owner if possible). You can also ask them to do a trial day while you are around. Have them come over and talk to you and see how your dogs react to the person.     |