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 R1 is halogen, C1-C3 haloalkyl or C1-C3 haloalkoxy； R2 is H, halogen, C1-C3 alkyl, C1-C3 haloalkyl or cyano； R3 is H, halogen, C1-C3 haloalkyl or C1-C3 haloalkoxy； R4 is halogen, C1-C3 alkyl, C1-C3 haloalkyl or C1-C3 haloalkoxy； R5 is H, CH3, C2-C4 alkylcarbonyl, C2-C4 haloalkylcarbonyl, C2-C5 alkoxycarbonyl or CH2O(C1-C3 alkyl)； R6 is C1-C6 alkyl, C1-C6 haloalkyl, C3-C6 cycloalkyl or C3-C6 halocycloalkyl, each group substituted with one R7； or R6 is (CH2)mQ； and Q, R7, R8a and R8b are as defined in the disclosure.
