Provided are dihydroisoxazole compounds I useful for controlling parasites both in animals and agriculture. Further provided are methods for controlling parasite infestations of an animal by administering an effective amount of a compound as described above, or a pharmaceutically acceptable salt thereof, to an animal, as well as formulations for controlling parasite infestations using the compounds described above or an acceptable salt thereof, and an acceptable carrier. Also provided are compounds and processes useful for making the dihydroisoxazole compounds.