: If you don't have a regular vet, you can visit Vetco vaccine clinics at local Petco stores for testing and prescriptions. 2. Select the Correct Product Heartgard Plus is sold in color-coded boxes based on your dog's weight: Blue Box : For small dogs up to 25 lbs. Green Box : For medium dogs between 26 and 50 lbs. Brown Box : For large dogs between 51 and 100 lbs. 3. Purchase Methods at Petco You can buy through several channels at Petco :

Because heartworm preventatives are regulated medications, you cannot buy them over-the-counter.

at Petco requires a valid veterinary prescription. You can obtain this through your primary vet or by using Petco's in-store veterinary services. 1. Obtain a Prescription

: You can sign up for recurring deliveries to ensure you never miss a monthly dose. New Autoship customers often receive a discount (e.g., 35% off the first order).

: Before a prescription is issued, your dog must have a negative heartworm test on file. Testing is critical because giving preventatives to an already infected dog can cause serious adverse reactions.