Disclosed is a method for protecting an animal from a parasitic invertebrate pest comprising treating an animal orally or by injection with a pesticidally effective amount of a compound of Formula 1, wherein R 1 is halogen, C 1 -C 3 haloalkyl or C 1 -C 3 haloalkoxy R 2 is H, halogen, C 1 -C 3 alkyl, C 1 -C 3 haloalkyl or cyano R 3 is H, halogen, C 1 -C 3 haloalkyl or C 1 -C 3 haloalkoxy R 4 is halogen, C 1 -C 3 alkyl, C 1 -C 3 haloalkyl or C 1 -C 3 haloalkoxy R 5 is H, CH 3 , C 2 -C 4 alkylcarbonyl, C 2 -C 4 haloalkylcarbonyl, C 2 -C 5 alkoxycarbonyl or CH 2 O(C 1 -C 3 alkyl) R 6 is C 1 -C 6 alkyl, C 1 -C 6 haloalkyl, C 3 -C 6 cycloalkyl or C 3 -C 6 halocycloalkyl, each group substituted with one R 7 or R 6 is (CH 2 ) m Q and Q, R 7 , R 8a and R 8b are as defined in the disclosure.