PetLock Max for Large Dogs 4 Month Supply by PetLock $38.95 Variant Options 4 Ct. - $38.95 Variant Options 4 Ct. Size 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart How Local Delivery Works: Order it online and we will deliver it within 1-5 business days. Order more than $99 and receive FREE 1-5 Day Local Delivery. See more details* Local Delivery Schedule: Tue: Newaygo, Mescosta, Montcalm Counties. Wed: Oceana, Mason, Lake, Manistee Counties. Thurs: Muskegon, Ottawa, Kent, Counties. *Orders must be placed by Noon the day before delivery date. Call for special requests. How Bulk Delivery Works: We offer feed bulk delivery service. If you can feed it to livestock, we can delivery it bulk. Order via Text, Call, Email. Minimum delivery 3-Ton Bulk. See more details* PetLock Max is a monthly topical treatment and preventative of ticks, fleas, mosquitoes, biting flies, & lice.