might be tapeworms. they're spread by fleas, so if she has fleas, that's a high possibility. every summer i have to give newman a dose of drontal to kill them, because even with the advantage, he'll still get a few on him that live long enough to give him a tapeworm. they break off in little pieces and they look like dried rice. it's gross.

i've heard that giving them tobacco kills the worms, but i've never tried.