What is a common tool used for trimming hoof edges?

A rasp is a common tool used for trimming hoof edges because it is designed to smooth and reduce the overall thickness of the hoof wall. Its coarse surface effectively files down rough edges, helping to keep the hooves in good condition. Unlike other tools, a rasp can be used to finely shape and polish the hoof after nipping or cutting has been done. It is particularly valuable as it allows the farrier or equine caregiver to maintain an even surface on the hooves, preventing issues such as cracking or uneven wear that can lead to discomfort or lameness in horses.

In contrast, nippers are primarily used for cutting or removing large pieces of hoof, a hoof knife is used for more precise cuts and cleaning, especially around the frog or sole, while an anvil is not related to hoof trimming and is used in metalworking. Thus, the rasp is the most appropriate tool for the specific task of trimming hoof edges.