Icelandic+ Collagen Puffs: Baked Beef With Lamb Marrow 2.5oz - Delicious and nutrious treats for dogs. Looking for the ultimate combination of a healthy dog treat that packs a flavor punch? Icelandic+ Collagen Dog Puffs are the perfect poppable protein treat your furry best friend is sure to love. With just two ingredients, Usa beef collagen and free-roaming lamb marrow, our puff treats are the perfect reward to get tails wagging. Crunchy, tasty, for dogs of all kinds. Large crunchy bites for medium to large dogs