Is a bit painful for a horse?

Excuse me, I couldn't help but notice the mention of a horse in the context of something being "a bit painful." Could you please elaborate on the situation? Are we discussing the potential discomfort or pain a horse may experience in a specific context? Is there a concern about the welfare of the horse, or is it simply a metaphor used to convey a particular sentiment? I'm genuinely curious to understand the full picture behind this statement.