We are trying a different product now. Stronghold which is the same as Revolution. I only switched because this is flea and heartworm in the same topical dose which works great since I occasionally forget one or the other!😁 We have used it for a couple months and so far it seems to be working great! Neither of my girls react like their in any type of discomfort like they did when we used K9 Advantix. As always pricing is great!