Hello how may I help you? Can you tell me how much dog food I should go through in a week? Absolutely! What kind of dog is it? I have an English Mastiff. He weigh about 100 pounds *weighs A dog weighing that much would require about 40 cups of dog food in a week. How does that convert into number of bags of dog food? You would need a 10 pound bag to last a week. Okay, Should I also give him treats? That's up to you. You could give him a few a day but not too many! Okay. Moderation is good. Thank for the help It is indeed. You're welcome!