Pet Chef Best Mushrooms for dogs. Top seven mushrooms for a;ll dogs to prevent illness and build immune support against various dog illness. This specially craft blend contains Turkey Tail, Maitake, Lion's Mane, Shitake, Cordyceps, Chaga, Red Reishi. Powerful herbal supplement works in concerrt to stop cell damage and immunity imbalances. Added Milk Thistle, Organic Ginger Root, expands the mushroom benefits and builds further dog health.