When shaping hooves, which part should be used as a guide?

Using the white line as a guide when shaping hooves is essential because it serves as a visual and structural reference for maintaining the proper balance and integrity of the hoof. The white line is the junction between the hoof wall and the sole, and it plays a critical role in the overall health of the hoof. By trimming to this line, farriers can avoid damaging sensitive tissues beneath the hoof and ensure that the hoof retains its natural shape and functionality.

Maintaining alignment with the white line allows for even weight distribution and helps prevent issues such as cracking or uneven wear. This is particularly important in preventing conditions like founder or laminitis, which can be exacerbated by improper trimming.

The other options, while important parts of the hoof, do not serve as the primary guide during hoof shaping. The frog is vital for shock absorption and circulation, but it is not the structural reference needed for trimming. The heel and sole are also significant but focus more on the overall health and function rather than providing guidance for trimming. Thus, the white line stands out as the most reliable reference in hoof shaping processes.