Hill's Science Diet Active Longevity Small Bites Senior Dog FoodSpecially formulated to meet the dietary needs of mature dogs 7 years and older, Hill's Science Diet Active Longevity Small Bites Senior Dog Food provides precisely balanced nutrition to sustain mobility and muscle mass in dogs preferring a smaller kibble. It is made with high-quality protein to maintain lean muscle and is enriched with glucosamine and chondroitin sulfate for healthy joints. Hill's Science Diet Active Longevity Small Bites Senior Dog Food also has controlled levels of sodium and phosphorus for long-term vital organ health.