Hi Sean; As a substitute for Ferretone, you can use organic flax seed oil, if you can find that. It even works better than Ferretone, as not having added Vit.A, it can be used as treats with no fear of overdose from the added vits. Mine love it! Check out the refrigerated section of your favorite health food store. Take care, Gary & the gang of fur Violence is not strength, Compassion is not weakness. From Camelot. [Posted in FML issue 1519]