Canadian Brand. Did you know that over 70% of the immune system lives in the gut? Gutsy Immune Bites have powerful prebiotics and immune boosting functional mushrooms in every bite. Crafted with a powerful blend of functional mushrooms, including Chaga, Lion's Man, Shiitake, and Turkey Tail, these bites are specially designed to enhance your pet's immune system, keeping them healthy and strong. Made lovingly in Canada in small batches, Gutsy offers a deliciously simple proactive solution to whole dog health.