I've been using Frontline Flea and Tick Preventative since it came on the market.

Unlike the over-the-counter (OTC) products you can find in pet product areas in stores, Frontline is only sold through veterinary practices.  The difference between this and the OTC flea or tick products are two-fold:

First, Frontline stays in the animal's pores and is not absorbed through their skin.  This makes it more effective since it stays where it's needed, and it's safer, since the other pesticides that are absorbed through animal's skin must be metabolized (processed) by their kidneys and liver.  Over...