I have twice sent the rebate forms, receipts, end tabs etc. to the Advantage Multi $20/$50 Rebate Offer in El Paso, TX. Both times they have rejected my rebate ($50) because they say I did not include the receipts from my Veterinary Clinic. They are technically correct because I didn't purchase the product from my vet clinic, I purchased on-line from Dr. Foster and Smith website and supplied their receipt/invoice showing my information, purchase price, quantity purchased and any and all information that is normally found on a vendor's receipt. Nowhere in the rebate offer does it state that the product must be purchased from a Veterinary Clinic. My veterinarian had to authorize the purchase from Dr. Foster and Smith as this product requires a prescription in FL. The first rejection stated that I had not submitted "the sales receipt from your purchase" the second rejection stated that I had not submitted "the receipt from your Veterinary Clinic as required." They choose not to provide any contact information except the PO Box Address in El Paso, TX no phone, no email.