I use Revolution on my 6. It covers every thing. Fleas, ticks, worms. and it does not bother them when I put it on. Jackie and Sadie have a reaction to the other ones. This one works best for them and they are not bothered by it.
__________________  Brenda  Jackie, Sadie, Rosie, Julie and Sophie my other non yorkie fur babies Romeo Lillie and  Sammie, Jessie, Callie, Cloie. |