Yes, you can buy Heartgard at Petco. Heartgard is a popular brand of heartworm prevention medication for dogs. It is available over the counter at most pet stores, including Petco.
Heartgard prevents heartworm disease by killing the immature form of the heartworm (Dirofilaria immitis) in your dog’s bloodstream. It is important to give Heartgard to your dog monthly, year-round, even if your dog does not go outside often or only goes outside for short periods of time. This is because heartworms can be transmitted indoors by mosquitoes.
If you are unsure of how to give Heartgard to your dog, ask a Petco associate for help. They will be able to show you how to properly administer the medication and answer any questions you may have.