Hello how may I help you? I need to know how much dog food I will go through in one week Sure! I know a lot about dogs. What kind of dog is it? A mutt about 50 lbs Food per week for a 50 pound dog. Got it. They will eat about 15 cups of food per week. Can you approximate in ounces? Sure! Each cup is about 8 ounces. That would be 120 ounces per week. Great. How many bags will this be? That depends. Will it be a 20 pound bag of food or a different size? I can grab a 20 lb bag A 20 pound bag of dog food should last about 2.5 weeks for a 50 pound dog.