Letter: Flea collars no boon to animals.
D000818:Animals; D002371:Cat Diseases / Q000139:chemically induced*; D002415:Cats; D004283:Dog Diseases / Q000139:chemically induced*; D004285:Dogs; D004478:Ectoparasitic Infestations / Q000662:veterinary*; D005423:Siphonaptera