We also switched from Frontline to K9Advantage for the dogs. Seems to be working great. Have been using it for over a year. Our one dog got sick for a couple of days after using Frontline. No problem with Advatage. Get it from Pet med. Many years ago we left to go on vacation and returned to a house filled with fleas. We used the Raid room bombs. Put one in each room. Stayed in the MH overnight. Followed up about 3 weeks later with another treatment. Didn't cost much. Good Luck they can be hard to get rid of.
