You don't get a prescription from the vet, just records of the visit and negative parasite test results are all that is needed. Additionally 1800petmeds and Chewy.com contact your vet for you. I faxed the veterinarian paperwork showing his results, with all the paperwork, emailed it, and had my vet call, but they refuse to ship without a prescription, which does not exist. Moreover, the reps are from the Philippines, claim to be from Canada, and say their products ship from Europe, yet the web site is listed to a Chicago owner with a disconnected phone number. Now I'm thinking I got scammed...