A dog eats every meal like it's their last, because for all they know, it might be. Since they have that viewpoint, a dog is very protective of their food. If you were eating and someone was bothering you, wouldn't it annoy you? Don't get rid of the dog, growling is just its way of saying that it needs some space. You must separate them!! Hopefully the little girl will learn to leave the dog alone while it eats.

Hope this helps!