I'm using Advantage II for extra large dogs. One tube is 4ml, which I can split into five .8 ml doses for my big cats.

I've read that the tick medications present in some dog meds are dangerous to give cats, so you have to be careful.

I have recently switched all my animals from meds with Fipronal (Frontline) to meds with what's in Advantage because the Fipronal didn't seem to be effective against fleas any more.