PROBLEM TO BE SOLVED: To provide an animal ectoparasite control composition having an excellent control potency against animal ectoparasite.SOLUTION: Provided is an animal ectoparasite control composition containing an organic sulfur compound represented by formula (I), and a triester compound (e.g., triethyl citrate, tripropyl citrate, tributyl citrate, etc.). [Cy is a phenyl group optionally substituted with an alkyl group or the like, a heteroaryl group, etc. R1 and R2 are each independently an alkyl group optionally substituted with halogen, H, etc. R3 is an alkyl group containing at least one F, or F m is 0 or 1, and n is 0 to 2.]COPYRIGHT: (C)2015,JPO&INPIT【課題】動物外部寄生虫に対して優れた防除効力を有する動物外部寄生虫防除組成物の提供。【解決手段】式(I)で示される有機硫黄化合物と、トリエステル化合物(例えば、クエン酸トリエチル、クエン酸トリプロピル、クエン酸トリブチル等)とを含有する動物外部寄生虫防除組成物。〔Cyはアルキル基等で置換されてもよいフェニル基、ヘテロアリール基等;R1、R2は其々独立して、ハロゲンで置換されてもよいアルキル基、H等;R3は、少なくとも1つのFを含むアルキル基又はF;mは0又は1、nは0~2〕【選択図】なし
