Sorry, just wanted to point out that not all flea preventatives enter the bloodstream. I know that frontline in particular does not.THEN it enters the blood stream through the skin
That's why our vet prescribed Frontline for Teddy. I don't use anything on my cat, since it's only the dog who goes outside. If he doesn't bring them in, Mickey won't get them....Although, I've heard of some dogs having really bad reaction to Advantix. I've never used it, as I've been warned by my vet that it's toxic to cats and shouldn't be used if you have them.