Good Veggie Diet for Canines?

I have a friend who is a vegetarian on what she feels are moral grounds, that is, she objects to the slaughter of animals for food. She has a dog, and she feeds the dog everything that she eats. She is very health conscious, balancing her diet, and trying to make sure her canine friend gets all of his dietary needs met. Is there anything in general she should be giving her dog in addition, some type of supplement or anything?