Dogs 50+ lbs. PreBiotics - healthy, strong defenses. Natural sources of Glucosamine for healthy joints. Select natural ingredients with added vitamins, minerals and amino acids. No fillers or artificial preservatives. Vet recommended. Iams nutrition proactively nourishes your dog to help keep him at his best. Healthy Joints: Specially formulated to help maintain healthy joints. Strong, Firm Muscles: Builds strong, firm muscles with protein sourced from chicken and egg. Healthy Heart: Nourishes the heart with 7 essential nutrients. Strong Immune System: Enriched with antioxidants to help maintain a strong immune system. Healthy Teeth: Crunchy kibbles scrub your dog's teeth with every bite, to help reduce plaque and tartar buildup that can lead to bad breath. Iams ProActive Health Large Breed Adult Maintenance is formulated to meet the nutritional levels established by the AAFCO Dog Food Nutrient Profiles for Maintenance.