best thing to do is.....................hurry up and wait, back up and punt, watch a movie, etc. LOL
seriously though, there is nothing you can really do but give it time. eventually he/she will realize that you are not food and even if you were, they wouldn't be able to handle it so usually they will un-hitch and retreat. i don't know, there might be other methods but mine have always eventually given up and i don't have to do anything but enjoy our quality time together.
galen