Get the little pamphlet book by Myler Bits. I think Dover Saddlery sells it, among other tack shops. It explains in detail what type of bit for what type of mouth. It is a wonderful book. You can even contact them and describe your situation and they will give you advice on what combinations to get. I once did this for a very difficult mouth to fit and the horse loved the bit.
I love my Sprenger Duo bit for my horse who has that kind of mouth. He fussed way too much with a double jointed bit. The Duo bit is a nice sculpted mullen mouth with room for the tongue .
Thanks for the suggestions. Coincidentally I have just borrowed a Myler comfort snaffle from a friend that I am going to try on Saturday when he is ridden next. I’m intrigued by the mullen mouth suggestions since he does have a large tongue it seems counterintuitive to have an unjointed mouthpiece but maybe its worth a try. Thanks again.
My horse has the same challenge. A mullen mouth snaffle has always been my first choice for him. Second choice was a baucher.
Cool thread!
My horse also has a low palate and a thick tongue. Any link has to be small and smooth or she objects. She’s not a fan of single-links as they hit her palate and put pressure on her bars. The bit we have settled on is the thin Sprenger loosering training bit - 14mm. She hangs on thicker bits but not on this one.
my two cents! Thanks for an educational thread!
J.
Put your hand in the mouth and see if that is true IF the bit hits in those places, it doesnt if the horse remains with a mobile jaw and ifv.
Oh, yes! Put your hand in the horse’s mouth to see the jaw “mobilize!”:lol: I never noticed whether they stay in front of the vertical though.:eek:
With all due respect, it seems like maybe you are doubting that a horse really can require a certain type of bit to be comfortable.
FWIW, I felt the same way for years - ALL my horses went in a french link. It was one of the things I loved about dressage - all those bit choices, basically taken away. Fix it by riding better! But the horse I have now has a low pallette and a thick tongue - and he HATES anything but a Myler Mullen Mouth. It has a huge curve in it and gives him plenty of room for his fat tongue but doesn’t poke him in the roof of the mouth.
Stick my hand in there? I’ll pass. Easy enough to read his responses without risking fingers!
But, there are no teeth where the bit goes.
:uhoh: They are darn close :lol:
The canines can be pretty close, although I guess they don’t pack much power 
I would recommend French link. However, this is a very mild bit so it’s not useful for a horse that pulls or is strong. I have a horse with the same issues as yours and he’s wonderful in the French link. He can’t stand anything hitting the roof of his mouth and the curve of the bit relieves pressure on the tongue. The bit just seems to pull on the side of the mouth. I believe mine is a Myler bit.
My Tb had that problem and after MUCH trial and error we went with a KK Ultra D Ring. Worked WONDERS! Best bit ever. The mouth comes in a baucher cheek, and a loose ring as well.
But the horse I have now has a low pallette and a thick tongue - and he HATES anything but a Myler Mullen Mouth. It has a huge curve in it and gives him plenty of room for his fat tongue but doesn’t poke him in the roof of the mouth.
Is it legal?
I think my guy would love one of them, but I’ve not bothered trying one, because I’m tired of knowing how amazingly he goes in a pelham, and never quite being able to reach that utopia because of RULES. :uhoh: :lol:
The myler mullen is legal as long as it doesn’t have hooks on the rings.
Yup, it is legal 
Timely thread. I’m having the same problem with my 3 yr. old connemara gelding. Non-existent palate its so low and fat fat tongue. I sent him out for driving training last year with the ultra kk, thought it was ok, this year for driving training he’s been really fussy with the bit, the trainer tried a french link snaffle then switched to a really fat rubber mullen mouth which he is going the best in so far. Next year I will get him started under saddle for dressage but can you really start one under saddle that way in a mullen mouth? It really is legal?
Sure is and I even used it for years when I was showing one horse. Small mouth, big tongue and the unjointed mullem mouth was the only bit that worked.
It doesn’t pinch or cramp that big tongue and they feel more comfortable.
Seems like the myler comfort snaffle is a success. We had control with a much quieter mouth. So far so good. Thanks all! Gotta love being able to come to you guys for advice/suggestions and opinions! George thanks you too!
This one is great for horses with thick tongues (the Pessoa Magic Relaxation bit). It is curved, has a copper center, eggbutt cheeks, low port giving room for the tongue, straight bars that don’t collapse (and therefore it’s actually safe for the palate). Has anyone else tried this bit? I ride jumpers so I’m not sure how common/legal it is for dressage; the lady at the store near me said she sells tons of them:
