Patent ID: 8445519

Claim:
A topical veterinary formulation for treating or preventing a parasitic infestation or infection in an animal comprising: (a) a 1-aryl-5-alkyl or 5-haloalkylpyrazole of formula (I): wherein: R 1 is hydrogen, cyano, halogen, R 8 , formyl, —C(O)R 8 , —C(O)OR 8 , —C(O)NR 9 R 10 , or —C(S)NH 2 ; R 2 is R 8 or —S(O) m R 11 ; R 3 is methyl, ethyl or C 1 -C 4 haloalkyl; R 4 , R 5 and R 7 are independently hydrogen, halogen, alkyl, haloalkyl, cyano or nitro; R 6 is halogen, alkyl, haloalkyl, alkoxy, haloalkyloxy, cyano, nitro, —C(O)R 12 , —S(O) n R 12 or SF 5 ; Z is a nitrogen atom or C—R 13 ; R 8 is alkyl, haloalkyl, cycloalkyl or halocycloalkyl; R 9 is hydrogen, alkyl, haloalkyl or alkoxy; R 10 is hydrogen, alkyl, haloalkyl or alkoxy; R 11 is alkyl, haloalkyl, alkenyl, haloalkenyl, alkynyl, haloalkynyl or cycloalkyl; R 12 is alkyl or haloalkyl; R 13 is hydrogen, halogen, cyano, nitro, alkyl, haloalkyl, alkoxy or haloalkoxy; m is 0, 1 or 2; and n is 0, 1 or 2; or a salt thereof; (b) a veterinarily acceptable carrier; and (c) optionally a crystallization inhibitor.