Dominix, with rider Whisp
Dominix was Whisp's favourite prowlgrin. Whisp had grown up with Dominix all her life, but when he appeared in the story he was considered to be very old. He competed in a Hive high-jumping event, won, and beat Cade Quarter, who was second. Because Whisp and Dominix won, they saved Tillman Spoke's prowlgrin business.