I recently placed an order online with California Pet Pharmacy for the Heartgard Plus in the 51-100lb. Weight range. Later that day a customer service rep gave me a call just to verify I was ordering the correct size since my pet is only 40lbs. And I ended up modifying my order to the lower range. They saved me the hassle of my vet declining the prescription! My order shipped within the next 2 days and received it shortly after! Very pleased with their customer service! Will be back again!