It might do. Pain on pooing is described as being like having cut glass pressed into you. I can't confirm this because I've never had cut glass pressed into me! But at its worst it is excruciating....usually it's not that bad though, I am sure he would be really screaming if it was as bad as it was for me at its worst (in fact, he would choose to hold his poo in if really bad). But if only a small tear, probably not that painful and worth trying to get it healed up quickly.