I recently discovered and tested out this product. My feeling about it is that it is worth a try. There is nothing to lose. If it helps your pet at all, great! If not (in < 30 days), then return it and get your money back.
The company says that your pets' level of health (including exposure to vaccines, drugs and other chemicals), will directly impact the effectiveness of shoo!TAG. This makes total sense in my experience. The same is true for attractiveness to fleas and ticks in general. Many products do not typically work well for infestations and heavy exposures. Personally, I'm not convinced that the strong chemicals used for flea and tick control are worth the potential (long-term and environmental) risk.
Please use this folder and forum thread to post your thoughts and experiences. I really want to hear them (and/or post a review at the store).