I use Advantage most of the time on my three cats. Their groomer suggests that I throw in a Frontline every third or fourth time to prevent the fleas from becoming immune. Anyway, I want to know if this is the best way. What do you think about Program? What is healthier for my cats?
It has been proven in studies that fleas do not become "immune" to advantge so you do not need to double up. Program is good but in my opinion advantage is better. vetcare