I have my cats on Frontline monthly. They are currently being harnessed trained and I hope to take them out by next weekend. I live in the DC area where there are mosquitoes, though now that the hot summer is ending, there shouldn't be as many of them around. In any case, the vet tech recommended I give my cats Interceptor on a monthly basis if I'm going to take them out. Is anyone using it along with a monthly flea topical? Is it overkill?