We've been using Advantage for cats on our kitty for four months, and decided to switch the dog over to Advantage too. After application, the dog shook, spraying little drops of it all over our living room. Any plastic the product hit (including the glossy black frame and base of our plasma TV) immediately developed PITS in the plastic, even though I grabbed a cloth to wipe it clean as soon as it happened. A Google search for "Advantage flea" and "plastic" shows that this has happened before and actually endangered an animal. Make sure you use caution when applying this product!! It's a good flea preventative, but this side-effect is not documented or warned about on the package.