My two boys, a chocolate lab and a Siberian husky, have never gotten along, never played, never been friends, and have definetely never liked to share. For quite a while, I had to feed them in seperate rooms and keep a close eye on them to make sure no fights erupted.

After eight years together, the boys are just fine to be fed together. They know their exact places in the "food room" and never go near each others' bowls.

I think the best thing you can do--with any type of training, really--is to provide consistency and assert your dominance as the leader of your pack. Maybe start by feeding them at the same time, on opposite ends of the room, with you in the middle. See how this works, and progressively move them closer to each other or remove yourself from the room, bit by bit. Reward them both for doing well, but firmly squash negative behavior.

Good luck!