Don't know if this is helpfull, but worth a try. I saw it on Animal Planet, one of the Animal Police shows. When they have an animal with food aggression, they actually feed them little bits at a time right from their hand. They put an empty bowl on the floor and place their hand in it, dropping a few pieces of food into the bowl at a time. When the animal eats them, they drop a few more. The object is for the animal to get the idea that having your hand near their bowl is a good thing, that it means treats are coming. I've never had to try it myself, but it works for them. Good Luck!