ValueBull USA Collagen Dog Chews, Fun Shapes Variety Mix, Natural Long-Lasting Dog Treats, 10 Pound Bulk PackValueBull USA Collagen Variety Mix is the perfect gift for your fur baby. Crafted from a single sheet of the inner, collagen rich layer of beef skin known as corium, Collagen brings benefits to nearly every part of your beloved pup. It starts with the gentle and natural dental and jaw muscle benefits of chewing a durable treat. From there, the highly digestible collagen is quickly converted into essential amino acids that help rebuild and repair your