Please tell us the difference between Frontline and Advantage. We have one nine year old male Collie weighing 98lbs and one year old female Collie weighing 50lbs. Our area is invaded with mosquitoes.
Besides the active ingredient, Frontline protects against fleas and ticks. Advantage protects against fleas. You may want to look into Advantix which is proven to repel mosquitoes and protect against fleas and ticks. vetcare