I purchased Frontline Plus from Vetshoponline and was shocked to see that the product was Australian since they do not disclose that information on their site. I used it on my two dogs and the became infested with fleas for the first time in over 10 yrs. I've previously used Frontline and it has worked in the past.
I called the Merial USA division and found out that the product that I bought from Vetshoponline is not EPA approved and not to be sold in the USA. They were kind enough to offer to replace my product with the US product.
According to Vetshoponline, all Frontline is made in France and is all the same... right. They really need to disclose where there products are from so that the consumer can make an educated decision.