http://www.roadsend-papillons-phalenes.com/2011/06/diatomaceous-earth-for-papillons-dogs_19.html
I would like to add another alternative, as far as keeping the fleas off of our beloved Butterflies the natural way.
Nematodes
You may purchase nematodes in your local pet, or garden/feed, seed store, or on line as for example Amazon does.
A lawn sprayer can also be used to apply the worms , and after about 24 hours you have reduced the flea population up to 80%.
See also Flea Allergy
Tear Stains