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ABSTRACT. Nunes T.A.P., Coelho C.N., Batista L.C.S.O., Fazio-Júnior P.I., Florencio C.N., Correia T.R., Fernandes J.I. & Scott F.B. [Efficacy of Flumethrin in the control of canine otocariasis.] Eficácia da flumetrina no controle da otoacaríase canina. Revista Brasileira de Medicina Veterinária, 35(Sup.2):81-84, 2013. Programa de Pós-Graduação em Ciências Veterinárias, Instituto de Veterinária, Anexo 1, Universidade Federal Rural do Rio de Janeiro, BR 465 Km 7, Seropédica, RJ 23897-970, Brasil. E-mail:firstname.lastname@example.org The aim of the study was to evaluate the flumethrin efficacy on the treatment of Otodectes cynotis in dogs infestations. Twenthy naturally infested beagle dogs were used. The mites were diagnosed through otoscopy, by cerumen analysis and subsequent microscopic identification of mites (X100). The animals were divided into two group soften: control, without treatment (GI) and a second group (GII) treated with a 1% flumethrin single application, fractionated in pour on and directly into the external ear. The dogs were evaluated daily for observation of possible side effects. To evaluate the efficacy, otoscopy were performed on days +3, +7, +14, +21 and +28. The control group showed mites through all the observation period. In the treated group, the effectiveness was 70%, 70%, 80%, 100% and 100% for days +3, +7, +14, +21 and +28, respectively. No adverse reactions were observed in treated animals. The flumethrin was effective in the treatment of otocariasis in naturally infested dogs.