Merrick Grain Free Senior Real Chicken + Sweet Potato Dry Dog Food starts with real, deboned chicken, along with sweet potatoes, peas, apples, blueberries and more. And because senior dogs have special nutritional needs, it’s made with leading levels of glucosamine and chondroitin for healthy hips and joints, plus L-carnitine for healthy metabolism. Plus, every bag comes from small batches made in Merrick’s very own kitchen, and then tested for quality and safety, so you know it’s good enough for your precious pup.