6-PACK SENTRY FiproGuard Plus Flea & Tick Spot-On for Cats (Over 1.5 lbs)

I've only used this product, Sentry Fiproguard Plus for Cats, on one of our myriad cats, but it appears to have worked quickly to either eliminate or severely depress the flea infestation. Time will tell if this is correct and if the effects last a month. But, the smaller volume of liquid and the less potent odor of the product (compared to some other flea killing spot-on products) made it much more acceptable to the cat and to me. I did not detect any adverse reactions to the product by the cat. Within the next month or so, I will have used this product on many cats and will be better able to assess its effectiveness.