Officials say a 10-year old boy was riding the pony named Pinto in a neighborhood at around 9:45 a.m. When the boy fell off, the pony made a run for it, galloping onto the 91 Freeway at Atlantic Avenue.
Police said someone in a black Toyota Scion clipped Pinto and took off.
Good Samaritans managed to corral the pony on the side of the freeway.
Pinto is OK and suffered minor scratches, and is back with his family.