Parasiticidal pyrazoles

A compound of formula (I):

• 12
• or a pharmaceutically, veterinarily or agriculturally acceptable salt thereof, or a pharmaceutically, veterinarily or agriculturally acceptable solvate of either entity,
• wherein
• R1 is 2,4,6-trisubstituted phenyl wherein the 2- and 6-substituents are each independently selected from halo and the 4-substituent is selected from C1 to C4 alkyl optionally substituted with one or more halo, halo and pentafluorothio;
• or 3,5-disubstituted pyridin-2-yl wherein the 3-substituent is halo and the 5-substituent is selected from C1 to C4 alkyl optionally substituted with one or more halo, halo and pentafluorothio;
• R3 is hydrogen;
• C2 to C5 alkyl substituted with one or more halo and with hydroxy;
• C2 to C5 alkanoyl substituted with one or more halo;
• C2 to C6 alkenyl optionally substituted with one or more halo;
• halo;
• amino or CONH2;
• R5 is hydrogen, amino or halo;
• R2 and R4 are each independently selected from hydrogen, fluoro, chloro and bromo;
• R6 and R8 are hydrogen;
• and
• R7 is hydrogen or C1 to C4 alkyl optionally substituted with one or more halo.