Yes, My Son Was Riding His Bicycle When A Large

Yes, my son was riding his bicycle when a large dog ran into his bicycle, killing the dog and my son Has 9 fractured ribs and a concussion. He was transported to the hospital where they examined him and he was sent home after spending a night in the hospital.
My son averaged 10-15 miles a day weather permitting. (he was wearing a helmet which split in 2 places and saved him from even more serious injuries) What is the outlook for him?