I use Frontline Plus on Levi every month and it works perfectly for us in our area. We've never had a problem with fleas. I would ask your vet for a recommendation for what product he/she recommends. They should know what works best in your area and would be able to give you guidelines and advice. I know if I call my vet office, I can speak to a vet over the phone and ask them these types of questions.
Also, if your pup already has fleas -- make sure to treat the carpets, blankets, bedding, etc. as flea eggs can hang out in there!
__________________ katy&levi 
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