An article posted today by Andrea Marie called ‘This Best-Selling Topical Treatment Will Keep Your Dog Free of Fleas All Summer (and It's on Sale)' about PetArmor dog flea/tick collars on Chewy.com is incredibly inappropriate and not well researched. I am a veterinarian and have witnessed a large number of pets that react negatively to counterfeit medication products that are sold through sites like this - there just isn't enough regulation to monitor and counterfeits look almost identical to the real products. Pet owners really need to obtain these medications from the veterinarian directly to guarantee the product, my practice and many others offer price matching to ensure pets are safe and guaranteed the correct product. Please be careful with this.