Editor's note: Flea and tick shampoos that contain pyrethrins and permethrin are toxic to cats and can be fatal. With exposure, cats can develop symptoms such as tremors, twitching, and vomiting.
Piperonyl butoxide 4%, pyrethrum extract (equivalent to 0.33% pyrethrins); shampoo + conditioner in one. <2yrs: consult physician. ≥2yrs: apply thoroughly to dry hair or other affected area.