Big puppies have big nutritional needs. Challenger’s sustainably sourced beef, lamb, and pork deliver high-quality protein for developing lean muscle, while balanced calcium and phosphorus levels support healthy bone development as your large breed puppy grows. Low-glycemic organic ancient grains like oats, barley, and millet provide steady energy for all-day play. Ethically raised proteins pair with nutrient-dense ingredients, like organic grains, pumpkin, spinach, and more, for nutrition that supports strong, healthy growth—from puppy paws to full-grown power.