Hello how may I help you? hi there can you tell me how much dog food I should go through in a week? I can help with that! What kind of dog do you own? I have a 100 lb Labrador Based on the size and breed of your dog, we recommend about 3 cups a day. In a week that would be about 21 cups of food ok thanks What other help do you need today? i see those big bags of dog food here at the store do how long would a 25 lb bag of dog food last for a 100lb dog? Do you need advice on which type of food to buy? That bag would probably be good for about a month thanks! No problem