We have 6 small breed dogs, and this past summer we got a red heeler, to scare wild animals away from the house and dog door. Rocco the heeler was about 4 months old when we got him, and like most young could eat his weight in food, stealing from the others. Since setting up the proportion pro, on open mode and Rocco wearing the tag, it funny watching him try to out smart the feeder...lol, and we are now able to fully control his food consumption..... thanks Proportion pro rx