07-28-2012, 11:03 PM
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Well if your horse's mouth is 5" but you have a loose ring snaffle in a 5" it may be too snug that the bit would pinch their lips so you'd need bit guards.. so you'd have to go up a bit size to a 51/4 or even a 5 1/2 depending.
Now for your bit, if her mouth is 5" then there generally needs to be 1/4 inch on either side. So if her mouth is a 5" so she'd fit 5 1/2 bit. But if her mouth is 4 3/4 then she'd fit into a 5 1/4.
I am not an expert so I could be wrong, but that's how it has been explained to me.