They simply MUST be apart when the dog is feeding!

Once the dog is given food it has every right to defend it. It has been allowed that food by the leader - the leader has taken what the leader wants - that food is now owned by the dog that has it.

That is a dog rule. You cannot change that rule. Some dogs are very submissive in this area and will give ownership of food back but it is a rule.

I suspect that you are leaving food down for the dog to have free eating?