Why do some horses need harsher bits?

Unfortunately, horses will probably not like the feel of the bit in their mouth. Since it is an unfamiliar piece of metal in their mouths, it will feel odd and unusual, and some young horses being broken in will not like the feeling and fight it. However, most horses learn to become accustomed to the bit, and accept it. We do not know just what the horses are thinking, but we can assume they are fine with the bit as they do not show signs of discomfort when it is in their mouths.

There are various different types of bits available, either harsh or gentle to help your horse feel comfortable with the bit.