Should you alow your horse to roll if it has colic?

In general, no - rolling increases the risk for torsion of the intestines and can cause strangulations, which are life-threatening medical emergencies. Without a veterinarian's diagnosis, it is difficult to tell what type of colic a horse has, so the blanket statement is to simply not allow your horse to roll.

Hand walking at a steady pace is recommended, and in cases of non-surgical colic can provide the same movement and massaging of the intestines that helps pass an obstruction or get the gas bubble out.