My recently flea treated cat has been coming inside at night with fleas all over his ears. This prompted me to check out my chickens to see if they had fleas as well, and I discovered several on the one of my RIR hen's face, comb, and waddle. I checked my two silkie roos and they appeared to be clear. How do I treat this? I've been reading about Sevin and diatomaceous earth. Do either of these affect the quality or edibility of the eggs? I prefer to go organic, however, my cat's vet has told me that the fleas this season are relentless. What could happen if I do not treat the fleas?