This year I decided to go cheap and purchase a less expensive brand of flea control... well I certainly paid for it with a nice infestation of fleas, even on my inside cat! I went back to this more expensive (but certainly more reliable) brand and the fleas have completely gone. I noticed with the cheaper brands they have a lot of liquid and it takes forever for the big greasy spot on the back of the cat's neck to try. How unsightly! But with this I couldn't even tell if I was putting any on them, it was so discreet. I will definitely be sticking with this from now on.