title: Letter to the editor.
authors.affiliation: Scientific Marketing Affairs, Merck Animal Health, Madison, NJ, United States. Electronic address: Robert.armstrong@merck.com.
authors.forename: Robert
authors.initials: R
authors.lastname: Armstrong
mesh_terms: D000818:Animals; D058251:Ctenocephalides; D004283:Dog Diseases / Q000188:drug therapy*; D058267:Flea Infestations / Q000662:veterinary*; D007555:Isoxazoles / Q000008:administration & dosage*; D009281:Naphthalenes / Q000008:administration & dosage*
chemical_list: D007555:Isoxazoles; D009281:Naphthalenes