MY VET TOLD ME I CAN USE FRONTLINE FOR DOGS ON MY CATS.....BECAUSE I HAVE SO MANY CATS...IT SAVES ME MONEY...YOU GIVE THE CATS A REDUCED DOSAGE OF DOGS FRONTLINE...A LARGE DOG WOULD FLEA 4 OR 5 CATS DEPENDING ON THEIR WEIGHT...I HAVE DONE THIS FOR YEARS~ YOU HAVE TO BE CAREFUL HOW MUCH YOU GIVE...
