On June 17, 2015, it was confirmed that McConaughey's character was named Buster and that John C. Reilly would voice Eddie, a sheep and Buster's best friend.
Pada tanggal 17 Juni 2015, dikonfirmasi bahwa karakter McConaughey dinamai Buster dan John C. Reilly akan menyuarakan Eddie, seekor domba dan teman terbaik Buster.