When does a close nail occur?

• A. When the nail enters the sole of the hoof
• B. When the nail enters through the white line of the hoof
• C. When the nail is placed in the center of the wall
• D. When the nail passes beyond the hoof wall

Answer: (B)

The idea being tested is nail depth relative to the hoof’s inner structures. A close nail is one driven so that it reaches the white line—the boundary between the hoof wall and the sole—putting the nail near the sensitive laminae. This proximity risks bruising or penetrating the sensitive tissue, which can cause pain, infection, or hoof damage. Nails should be placed in the thick part of the wall without crossing into the white line, so entering through the white line is what defines a close nail. Nails that go deeper and beyond the hoof wall or into the sole pose different problems, while a properly placed nail sits safely within the wall.