Our dog got infested really badly this year with fleas, mostly due to the high humidity and Frontline stopped working for us too. We went to the vet and bought a product called Comfortis which is a once a month tablet that kills all fleas on the dog within two to four hours and lasts one month.
It is quite expensive- about $90 for six months worth, but I get bitten so badly by them that it was definitely worth it.
You should also treat their environment, but I found the Comfortis helped with this because any fleas that jumped on the dog met with a pretty quick death.
The downside?? Goodness knows what sort of chemicals I was pumping into my dog by using this tablet- I used to joke to DH that he was radioactive! but it does work......
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