Hill's Science Diet Adult Large Breed is a dry dog food formulated specifically for large breed dogs aged one to five years. Built on a chicken and barley base, it targets the energy requirements and musculoskeletal needs that set larger dogs apart from medium and small breed counterparts.

The formula controls fat levels relative to protein — large breed adults benefit from lean muscle support without excess calories, given the load their joints carry at higher body weights. Glucosamine and chondroitin are included to support joint health before degeneration becomes a concern. Chicken provides the primary protein, with barley as a digestible carbohydrate that suits most adult digestive systems.

Large breed dogs have different daily nutritional requirements from medium or small breeds — higher protein-to-fat ratios, joint-specific micronutrients, and kibble sizing that encourages proper chewing mechanics. Hill's Science Diet structures this formula around those differences rather than scaling up a generic adult recipe.