So two days ago I rode my horse Finn and I noticed that everytime I would use contact in the reins he would throw his head up, I know that the only other time he has ever thrown his head up is when you see-saw the reins. This time he did it even when I just I pulled back on the reins lightly or gathered contact with the reins. Yesterday while putting on his bridle(I was going to ride) I remembered what had happend two days ago and decided to check his mouth. I saw that (if you were looking towards him), his right corner of the mouth looked like a split callus. It didn't look THAT bad but I thought it was bad enough to cause him pain. I put some Vaseline on both corners of his mouth, especially the right side. I then dropped the bit down two holes so that if I used any rein contact he wouldn't have as much pain as he would with keeping the bit really high up. Personally, I always thought that the bit was too high up, so I am very happy to have a reason to lower it. So my question is, if you have ever had this problem or know someone who has, I would really appreciate any advice on how you helped "cure" it, or have had it happen to you, and found a way to stop it from occurring. Thanx!!