At such low prices makes you wonder if they are truly legit. I kept my old box of Comfortis and found some of the markings are a bit different. One is manufactured in the USA and the other in South Africa, the one I received. I'm afraid to give it to my dog. Nor did they ask for a prescription compared to the USA where you need one if you order online.
I also found out that they don't send you any info as to when the product has shipped. I had to write to find out that status of my order.
Lastly, I was charged an international fee, nowhere does it say you will be charged that when you place your order.