If you are ordering your refills through My Pet Prescriptions and no longer have refills remaining, simply add the item to your cart, check out, and we will contact your vet for approval. If you run out of open refills on your pet's prescription and a repeat delivery order is scheduled, please allow 5-10 days for us to contact your vet for approval. If your vet approves, you should receive a ship notification. If your vet does not approve, you will receive an order cancellation notice via email with reason for cancel. If your order is canceled for vet not approving, you may need to see your vet to renew your prescription. Prescriptions, including refills, are fulfilled by Express Scripts Pharmacy in partnership with Petco.