Pure Single-Ingredient Cod Skin Chews. Give your dog a naturally delicious chew that supports their health from teeth to tail. These Icelandic Cod Skins are made from 100% wild-caught cod sourced from the pure, icy waters of Iceland - air-dried with geothermal energy and processed using glacial water. Nothing added, nothing artificial. Plus, they're naturally rich in Omega-3 fatty acids to support a lustrous coat and healthy skin.