And naturally, just when I say that the Brewer's Yeast is doing the trick - Jimmy gets attacked by the FL mutant fleas. The grandkids were visiting - I don't know if they walked through a flea-infested area that I normally don't visit; but I recognized the frantic scratching and gave him a dose of Bravecto. Within about 5 hours of him receiving his "treat", I began to pick dead fleas off him. The stuff is amazing. It's now 24 hours later and he's resting comfortably, and the huge welts left by flea bites are abating. I still don't *like* to use it - but his comfort is important, too. By the time this dose wears off, we'll be back in Michigan with our "nice" fleas.