The Costco membership perk, which costs $65 per year, can provide a significant financial boost for pet owners who transfer their prescriptions to the warehouse's pharmacy. The retailer's Gold Star membership can be significantly cheaper than the upfront fee. A survey by GoodRx Research found that 46% of dog owners and 27% of cat owners spend at least $200 a year on prescription meds for their pets. Additionally, Costco's pharmacy also fills pet prescriptions, including those from the company's Ozempy and Wegovy. The cost of the membership can also be significantly reduced if saved at the pharmacy.