I had ordered a Seresto flea collar and had asked that it be shipped regular USPS 2 to four day shipping. The post office made a mistake (no fault of Pet Meds) and it was somewhere in Illinois after 5 days (I live in FLorida). I explained that the fleas were getting bad and Pet Meds shipped me another collar overnight at no charge and asked that if the original order comes, just write return to sender on the package, and send it back. They have amazing customer service! There was a human that answered the phone, she was intelligent, courteous, and went beyond what I expected in customer service. I will only use them from now on. (By the way, the price was excellent compared to other mail order companies too. I checked).