[Minnieski]

Oh man, I'm sorry to hear that. We use comfortis and haven't had trouble with fleas. When we moved to TX I was really worried about it because a lot of people told me that Frontline doesn't work down there - the fleas are rather immune to it. You might want to give it a shot - just make sure you give it to them with food because mine throw up if you give it to them on an empty stomach.

 

[Minnieski]

It's not cheap, but I don't think it costs any more than frontline. I buy all of my dog meds from petcarerx.com because they tend to have pretty good prices, but it takes a few days for shipping, so you might want to buy an initial dose at the vet's office and see if it works.