I used Advantage for Mia because she had fleas when I first got her and I couldn't get rid of them, the Advantage worked for about 2 days and then they were back. I switched to Frontline and haven't had one flea since. I've heard Frontline Plus can be bad for small dogs so I just use the regular Frontline. I buy it from
www.petvetdirect.com, they sell it a lot cheaper than other places!