Which of the following is NOT a reason for needing shoeing?

The correct choice signifies that a new coat of hair growing in is not a reason for needing shoeing. This is because the growth of hair is a natural process related to the horse's overall health and maintenance rather than a factor that directly impacts the hoof's condition or the necessity for a shoe.

In contrast, the other options are legitimate reasons for needing shoeing. A loose shoe can create discomfort for the horse and affect its movement, necessitating a reset or replacement. Hoof overgrowth indicates that the hoof has grown longer than is healthy or manageable, which can lead to further complications without proper shoeing. Lastly, uneven wear on a shoe indicates that it is not providing proper support and alignment, which may lead to lameness or discomfort, thereby necessitating shoe replacement or adjustment.