Sure, chemical compounds kill them; I get that. If your animal is nursing, pregnant, aged and on medication, seek the advice of your veterinarian before use. Flea are killed pretty speedily with K9 Advantix as it stops biting fleas in minutes and kills 98-a hundred% of the fleas on your pet inside of 12 hrs. If there is black debris or a thick coffee grind like substance on the cotton swab, then your cat has ear mites.