well I'm a dog person and I've had that problem before.. put the plates a bit farther apart having the bully big dog closer up front nearest you ... stay there and watch them eat.. make sure you bring out some special treats and the hose with you... whenever the bully big dog goes near the puppy call it back to its own dish and reward it with an extra special treat.. if the bully big dog doesn't listen to you and goes for the puppy squirt it with the hose.. do this until the behavior stops and trust me it wont take that long at all if you use both positive treats and negative squirt of the water for reinforcements. After this has stopped and you no longer have to call him away and treat him or squirt him with the hose still every now and then like every other day watch them eat and tapper off to once a week just to make sure he doesn't start doing that again.