One of the most common indications that you should consider a bit change is when in good training the horse appears uncomfortable in the mouth, fussy, or fidgety. Perhaps the horse is uneven on both sides of the mouth with no corresponding physical reasons. It’s also important to distinguish between a horse that is running through the bridle and a horse that is leaning on the bridle. In the first case, a stronger bit may be needed. In the second case, the problem is one of balance and should be fixed through proper riding and training (see “Better Balance” in the June issue).
When choosing bits, it’s important to consider the shape of a horse’s mouth, as not all bits fit the same. A horse with a small mouth or limited room between the tongue and roof of the mouth may find a fat snaffle uncomfortable, rendering a ‘soft’ bit more harsh. You have to also consider the action of each bit, and take into account how it works. Does it create pressure on the poll, bars, or curb area? Does it provide leverage or elevate the bit in the mouth? Does it allow space for the tongue?
Hackamore bridles may be of use occasionally if a horse has injured its mouth and is in need of a break from a bit. There are some horses that go very well in a hackamore, but care should be taken in using one, as it can be more difficult to control the horse, or alternately it can be a strong bridle in its own right.