I have a few questions that I am not too sure of.

why is it inadvisable to make a horseshoe magnet from a flexible material?
-is it because it would have enough magnetism

Do the poles of a horseshoe magnet attact each other? If you bend the magnet so that the poles get closer together, what happens to the force between the poles?
-Yes, because of the opposite poles. The force between the poles become stronger.

2 answers

If the material were flexible, wouldn't one pole join another?

Second answer is right on.
magnets attrac each other