thats funny cuz our yorkies are the worst mousers ever! we live right by a big lake so we'll get a few that come inside during the winter and the dogs have NEVER caught one. our dogs get all excited if we catch one in the trap but don't even come close to catching any mice themselves. I wonder if they even try sometimes. i kinda wish they were a little better at what they were bred to do! oh well, we love them anyways haha