15 lbs. If you would like to learn more, we invite you to call our Pet Professionals at 877-546-9581, 9-6, est, Mon.-Fri. or 10-2 on Sat. 15 lbs. bag of IAMS Mature Adult Large Breed Dry Dog Food for Senior Dogs with Real Chicken. Our Pet Professionals are knowledgeable on all of our products and ingredients, and happy to answer any questions you may have. However, we may, from time to time and at our discretion, have special offers or promotions that would allow you to collect eCTM on that portion of a transaction in respect of which you redeemed eCTM.