: A convenient option if you want to buy online and pick up in-store today. They typically stock the 3-packet treatment boxes. Amazon : Frequently the fastest shipping option. You can find the Merck Animal Health Panacur C

You can purchase , a common over-the-counter dewormer for dogs, through major online pet retailers, big-box stores, and local veterinary clinics. Top Online Retailers

: Similar to Petco, they stock the brand-name Merck packets and offer "buy online, pick up in-store" services.