Hello how may I help you? Hi I need some info please Sure, how can I help? how much dog food should I go through in a week? What kind of dog? I need to see how much a big bag will last this is for a golden retriever he is about 100 lbs I am not sure how much to buy and how long it will last for a bag You should give him whatever he want, he's a good woof! lol Don't worry about money. but seriously, I need to know so that I can get enough bags of dog food right now You should go through about 1 big bag a week.