The best Equestrian Bits: Reddit reviews

From 3.5 billion Reddit comments

You can get a bit sizer if you like, though I've found it easiest to just try bits in different widths and see what fits best width wise.

My best advice is to ask friends if they have spare bits you can borrow and try out. Start with the simplest, maybe a loose ring snaffle, and make adjustments from there. My experience has always been that it takes time and testing to find the bit the horse likes the best. I always give them several rides in the bit too (unless there are obvious issues immediately), just to make sure the issue isn't "this is new and I'm not sure about it" as opposed to "I definitely don't like it".

I had an OTTB briefly that loved the fattest rubber snaffle I could find, like it almost looked like his mouth wasn't closed all the way, it was so big. I had another who wanted an average thickness double jointed with the lozenge. The first preferred loose ring, the other liked the stability of an egg butt (he may have been fine with any other more stable bit too, but I didn't tweak any more after I found he was happy in that).

It's for horses.

A flexible rubber mouth bit could be a good option if she doesn't tend to chew her bits. At least until the rash calms down and you can find other options.