K9 Advantix repels mosquitoes, as well as ticks. I used it for a year or so, and can testify it works. The only reason I switched back to Frontline is because a holistic pest guy (yea, I know) told me Frontline is better at long term eradication of ticks. I very well might go back to K9 Advantix next year, though, because I've found a tick or two on Yogi since switching back to the Frontline.