title: Letter: toxicity of flea collars.
mesh_terms: D000818:Animals; D002371:Cat Diseases / Q000139:chemically induced*; D002415:Cats; D004006:Dichlorvos / Q000633:toxicity*; D004283:Dog Diseases / Q000139:chemically induced*; D004285:Dogs; D005423:Siphonaptera
chemical_list: D004006:Dichlorvos