On July 6, 2015, Chasing His Horse was banished from the Fort Peck Indian Reservation as a "safety threat", due to charges of "human trafficking, drug dealing, spiritual abuse and intimidation of tribal members."
Chasing His Horse played the part of Smiles A Lot (Lakota: Iȟá s’a) in Kevin Costner's movie Dances with Wolves. He appeared in three TNT telefilms with First Nations actor Eric Schweig: The Broken Chain, Into the West and Bury My Heart at Wounded Knee.
