The right size of the hoof bells depends on how big the horse's hoof is. In general, keep in mind that the bell boots should not rub or twist too much when the horse is moving. You can see if they fit properly by the fact that they are neither too tight nor too loose. There must be enough space between the pastern and the bell boots so that it is not obstructed. The bell boots should not create pressure or chafing and should not rotate during movement. Also, the bell boots fit properly when the rim ends a finger's width above the ground. Some models have a built-in cam or bulge, which must sit centrally on the bulb of the heel. These variants have the advantage that they usually do not twist.