Nulo Challenger Alpine Ranch Large Breed Puppy (Beef, Lamb & Pork) – This grain-inclusive large breed puppy formula features the same ethically-sourced beef, lamb, and pork protein blend as the Alpine Ranch recipe, but is specifically formulated for big pups. It contains controlled levels of calcium and phosphorus to promote proper bone growth and joint development in large breed puppies. Rich in animal protein (over 80% from meat) and supplemented with organic grains, it fuels healthy muscle growth and steady energy. Added probiotics and fiber support gentle digestion, and glucosamine helps support growing joints. It’s a powerhouse recipe that gives large breed puppies peak nutrition for a great start in life.