i dont know about regular frontline but i just checked both frontline plus formulas and they are not the same. i dont know if this makes a difference but frontline plus for dogs contains 9.8 percent fipronil and 8.8 percent (S)-methoprene. the frontline plust for cats contains the same amount of fipronil but 11.8 percent (S)-methoprene.Originally Posted by Rina_Marie
So when we got our first cat, we called the Frontline company to find out whether the cat formula was the same as the dog formula. They let us know that it is the same (only packaged differently), and also told us how much of it to use on a cat.