Many of the largest pharmacy networks in the U.S. fill pet prescriptions — Target, CVS, Walgreens, Rite Aid, Kmart and Costco all fill pet prescriptions in person. Several of these locations also count pet prescriptions as part of their rewards programs. Several pet supply companies also offer prescription services, including Chewy and Petco. Some pharmacies even work directly with pet insurance companies, so you don’t need to submit receipts for reimbursement.