Hello there, I have been looking into adding another dog into my home for at least 6 months now, I was looking prior to that, but after my chihuahua passed I stopped. I must have done at least some reading on every pure bred dog 60 pounds and up at least twice, and I have found that a Great Dane or English Mastiff would best suit my home. I do have some experience with large breeds, and I do plan to do obedience training as well. (Just in case anyone asks) Pretty much I'm curious what the average feeding costs for an English Mastiff and a Great Dane would be, from what I understand Great Danes do not require as much food as English Mastiffs, the food I currently feed my chihuahuas is Orijen, most of the pages I've found on feeding are for foods like Iams, Pedigree and Eukanuba, which I refuse to feed my dogs, with the food my dogs are on, they do not require as much food as they would with Iams, they generally eat about half to a third of the recommended. For a 15 pound bag it costs around $65-80, it varies from the types. I'm looking for the average price or amount of food for an active adult, not for a puppy. If you do not know an approximate price, then just the amount of food you give your dog a day or week. Just to add, the price for the food is not a deciding factor, if need be, I don't mind spending $200 on food every month, I just want to get all the facts before I buy. Thanks.