“I have been using Sentinel for over 20 years with my dogs and am very happy to have found Allivet to order them through. Have never had adverse reactions in my dogs, which are Border Collies. Some herding breeds are sensitive to ivermectin, which is the main ingredient in other types of heartworm meds. Sentinel uses milbemycin oxide, and my dogs have never had a bad reaction to it. I am so happy to have found Allivet to purchase them through, as they are always in stock, fast shipping, long expiration dates and friendly customer service.”
