Our Dr. Lucy won't let us use flea shampoos, etc. on Toto either! When she was really tiny [puppy] we had to only put half a tube of the Advantage on her ... now she gets a whole one. We can use it as often as every two weeks because I bathe her so much. It works well for her ... but we seldom let her on the ground and she usually only gets a flea from my son's Border Collie! Missy is an inside dog but also gets to potty and play outside ... she hates Toto but is always glad to share a flea with her! I swear she smiles!!