The child's mother says her son suffered ... "Officers learned that during a riding lesson, a juvenile rider fell from a horse after an unknown female subject approached the horse from behind ...

On Monday, Daly City Police announced that they had arrested Tomasa Panjojleon, 29, on suspicion of felony child endangerment ... the boy was taking a riding lesson on a horse from Ocean View ...

causing the horse to spook and buck off a young child. "It blew all of our minds that someone would one, do that to the animal, do that to the child that was riding," said Caroline Reed.