its happened to one of my dogs,but not a running dog a terrier my bedlington ,when she was 4 months old. it was a licra man on a push bike came speeding from nowhere and hit her,she broke her pelvis in 3 places .she limps now and then but she doesnt let it bother her when we are out i suspect she will have bad arthritis as she gets older .i never managed to murder the cyclist as he dashed off as quick as he appeared