Pet Wellbeing's Canine Milk Thistle for dogs is allnatural, glycerinebased, and safe for dogs with compromised livers. Milk Thistle should be administered to every dog taking liver taxing medications and especially if the liver is damaged. The active ingredients in Milk Thistle are known as silymarin. These ingredients help maintain the health of your dog's liver, scavenge for harmful free radicals, help guard against toxins trying to bind to the dog's liver, and support the stability of liver membranes. As an antioxidant, silymarin is even more effective than vitamin E. It also helps support the production of new liver cells in dogs.