Icelandic+ Beef Collagen Puffs with Marrow Treats for Small Dogs. Looking for the ultimate combination of a healthy dog treat that packs a flavor punch? Collagen 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. Small crunchy bites for small dogs. Sustainable sourced, free-roaming lamb marrow from Iceland Made in small batches in the USA Available Size: 1.3 oz