How much should i feed my dogs a day?

How much you feed them depends on their weight and the guidelines should be on the label of the food you're buying them. Secondly, if you look at the ingredients of most large breed puppy food, it is a lot of the time, very close to what the regular adult food is for that particular brand. And, the adult food is always less expensive than the puppy food. Not telling you what to do, just giving you some "food for thought".