Personally, I don’t rely on brewer’s yeast alone for flea prevention for my dogs. It’s supposed to be a natural repellant, but as to it’s killing properties, I can’t speak with any authority. Brewer’s yeast is just generally good for dogs and they love it. If your dog already has fleas, I wouldn’t rely on these biscuits to kill them. You’d need a commercial product used as directed to do that. The natural cycle of fleas is approximately 8 weeks, but you’d need 3 applications (3 months) to completely destroy the eggs.

Hi June–there’s none that I know of but check out my other dog biscuit recipes. There’s a few with egg in them, but most don’t contain it at all and you can basically use any flour–getting the rollable dough is the only thing to really achieve with them. Here’s a link to the dog biscuit recipes–dog biscuits