we have always used the Revolution as it has the heartworm and the flea prevention in one dose and i like that it is based on weight. some of the topicals are way too strong. All my girls except Princess are on the 5-10 lbs. dose. Princess is still on the 1-5 lbs dose. We have fleas and mesquitos year round in Texas so this works for us. None of my girls have ever had a reaction to the treatment and have never had a flea. They love being outside so i know they are protected.
This reminds me...today is bath day and time for the Revolution since it is Oct. 1.