If you purchase preventives from sources other than a veterinary hospital or a website affiliated with a veterinary hospital, you don’t have any guarantee that the product is authentic or that it has been stored and shipped properly. When you order from your veterinarian, you’ll have the added benefit of being able to rely on his or her expertise and knowledge of your pet’s medical history. Finally, Blue Ridge Veterinary Services can assist you if you purchase our products and then have concerns with a product or a reaction. Store or online retailers are unlikely to be much help with returns or product failures.