Family members say they believe the boy's horse was provoked by other horses, and likely threw him from the saddle and dragged him.
Lawrence and his brother were set to compete in a youth rodeo Wednesday. Family members said he wanted to become a bull rider.
Family members said Lawrence competed in track and field, and even made a pole vault out of supplies he found on the family's small ranch. They said Lawrence loved the outdoors and was looking forward to joining the seventh-grade basketball team in Kellyville.
His funeral will be held Monday.