1st time in 15 years we've had fleas. Dogs have been Frontlined, but still have fleas. Been flea combing, using Diatomaceous earth. Still fleas. Thinking of trying Advantage. Prefer least toxic pesticides. Any other suggestions? Advantage OK stuff?

It's fine. Better, I think...

I had the same problem. My vet gave them comfortis and the fleas are gone. I bought enough to dose them the next month too but waited to see if the fleas came back. They didn't.