Do you mean a straight bar rubble snaffle? They can be a bit bulky in smaller mouths.
It is all academic, even a soft bit can be harsh in the wrong hands, and a severe bit, ridden very lightly, can be kinder if the horse has learned to respond to the slightest movement.
I would recommend a double jointed bit with fixed cheeks - there are plenty of manufacturers who make something in the catagory
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I would say a straight bar loose ring like happy mouth or NAthe but think depends on conformation of the horses mouth
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Completely agree, had my new mares teeth done the other day, asked dentist what bit he thought would suit her, apparently she has a big tongue and a small mouth. I'd been using a happy mouth straight bar loose ring, which was fine but she'd fight it a little turning and stopping, (she's only just being backed) So I thought this was quite normal. He thought it would be putting a lot of pressure in the wrong places and suggested I swap to my kk ultra lozenge loose ring. Immediate difference, she doesn't fight it at all and stops and turns beautifully for a baby, and thats just after 1 session with it. Very impressed. So maybe it's more about the individual horse as to whats mild, a bit like saddle fitting?
My instructor got me to swap to a really thin myler becuase my horse has a typical ID mouth - fat tongue, low roof etc. She is much happier in it than her thicker mouthed french link - I always thought the thinner the mouth peice, the more severe.
I agree conformation has alot to do with it. What about french link, loose ring flexi-mouth? i use that on her to jump as she was not very confident about taking the contact.
, to find out the anatomy of your horses mouth/tongue/dentition , this may help you to have the knowledge of choosing a suitable bit.
Just a thought, it's what I'm going to do in May !