This blinded , multi-center study in client-owned dogs evaluated the flea control provided by a single oral fluralaner treatment ( 25-56mg / kg ; Bravecto , Merck Animal Health ) compared to a control group administered three oral spinosad ( 30 - 60mg/kg ; Comfortis , Elanco ) treatments at 4-week intervals together with an amitraz collar ( 9 % , Preventic , Virbac ) .