His mouth isn't narrow, but the top and bottom are close together. Thus, the issue is the bit hitting the roof of the mouth. I was really hesitant to get a loose ring snaffle and just gave in when she said that's all they had and the bit was so thick she couldn't imagine pinching (I still think she was incorrect). However, I'm returning the bit anyway because I think it's going to be way to thick for his mouth and I think the French link, since it's flat, may still cause problems. I just ordered the D-ring double jointed snaffle with a copper peanut (That's a plus because I did want copper!) that I posted above. I think it's a lot more likely to work than the one I bought at the tack shop.