At Polkadog, they are all about locally sourced, made-in-the-USA, limited ingredient natural dog treats. Polkadog’s super-duper fish skin dog treats are no exception. The cod they use to make these cod skins for dogs is caught wild in season by fishermen on small boats in Alaska. They hand-roll and slowly dehydrate each skin in their Boston kitchen to create these crunchy, savory, healthy cod skin treats.