I'm confused here.... My Vet told me never to use both Frontline and Comfortis together, however you can use Frontline and Capstar. Frontline and Comfortis used together in one month is like giving your pup a double dose and could be deadly. It would be fine to rotate between Frontline and Comfortis every other month, so a tolerance doesn't develop, but they should never be given together in the same month and/or every other 2 weeks... You could however give a pup Sentinel OR Interceptor and Frontline OR Comfortis in the same month. |