Bravecto ( fluralaner ) tick-control efficacy on treated dogs at weeks 2 , 4 , 8 , and 12 was 99.9 % , 99.9 % , 99.7 % , and 100 % , respectively , and Frontline ( fipronil ) tick efficacy was 97.6 % , 93.8 % , 100 % , and 100 % , respectively .