I recently took one of my rabbits to a vet who confirmed fleas. As such I learned that a product is out there on the market called Advantage. It is a pesticide so always use with caution! Anyway, this Advantage is normally used for cats and dogs but here is what I found out: Advantage can be applied to rabbits ONLY in the dose recommended for kittens, which is contained on the package label. Always apply this dose on the back of the neck in proportion to the shoulders of the rabbit. This prevents licking of the pesticide by the rabbit, which will irritate the rabbit. Make 100% sure that you get the medicine to come into direct contact with the skin or it won't work. Advantage is available only through a prescription from your veternarian. In approximately 12 hours (at the soonest) fleas will be killed which includes the eggs). This will last 4 weeks before you must apply the Advantage again. Fleas can kill but so can the Advantage if not applied to the rabbit EXACTLY AS DIRECTED. And this Advantage works extremely...extremely...well.
Have a cozy day!