Please see the following links for help with Counter Surfing & Food Stealing...

Zac George - Leave Anything/Counter Surfing - https://www.youtube.com/watch?v=JYsdozy4fVc

Kiki Pup - Stop Counter Surfing - http://www.youtube.com/watch?v=xZCIeEUm_n8

Karen Pryor - End Cunter Surfing - http://www.clickertraining.com/node/1034