Another thought on this: try diatomaceous earth Avoid the swimming pool variety (it's the wrong grind/size), get the garden variety, or, better, from a healthfood store so it doesn't have pyrethrins in it DE is known for it's internal parasite killing properties when used in animals A local man who uses it (on and in animals, and sprayed on surfaces, and he takes it himself and despite his age he looks terrific) --he has plenty of wild and wonderful stories about it "worming" animals like pigs, horses and cows So it should work on a cat, too Debby [log in to unmask] who just discovered that the period on her keyboard has stopped working