Hello how may I help you? How much dog food should I go through each week? That depends on what kind of dog you have. What kind of dog do you have? I have a chihuahua. Is your Chihuahua fully grown? Yes. Your dog should be eating approximately 1 lb of food a week What if he is eating more than that? Is your dog overweight? No. That is fine as long as your dog is not obese or getting fat