For almost a year I have been giving to my dogs "brewer's yeast" against fleas and it's working perfect !
And they love it !
For the small one (Jack Russel) I'm giving 4 or 5 tablets and for the big one (a beagle)6 or 7 .

We didn't have fleas in our home before I start with this natural treatment, that is propably why it was so effective. (I had been using Advantage or Frontline for a long time). I chose this natural treatment to cut reduce the amount of chemicals my pets are exposed to. So if you have problems with these little devils I think you need to get rid of them in your home before starting the natural aproach with the pets.