Go Native O.

Let me just start by saying that the only reason I gave more than one star was because of their online customer service. My senior dog has mobility issues and requires pain meds. I placed orders over two consecutive months for the same meds for the same pet, and had issues both times that were only resolved because I called them.
First, in order to enter a different shipping address than my billing address I had to reenter my card information. This did two things: 1) It triggered a fraud alert on my card, which then was declined; and 2) It changed my billing address to be the same as my shipping address, which also resulted in a decline on my card.
Second, they never informed me that there was a problem with my order. They merely sent me an email that confirmed my order. I only found out there was a problem with my order when I logged back on to my account to check on my order, and saw the order status which read "Problem" as a hyperlink. When I clicked on the hyperlink, the exact same page loaded again in a new tab of my browser. It provided NO information about the problem with my order.
Both times I have used the website to order I have ended up calling customer service to have them complete the order. The website is useless, and I will not be using it again. I will use a different provider next time--one whose website actually works!