Which set of factors are listed as causes of thin soles?

• A. Poor nutrition
• B. Excessive wear, slow horn growth, excessive trimming
• C. Infections
• D. Excessive moisture

Answer: (B)

The tendency for thin soles comes from a mismatch between how much horn is worn away and how quickly new horn can grow, plus how much horn is kept through trimming. When wear outpaces growth, the sole thins because the protective horn is eroded faster than it can be replenished. If horn growth is slow, there isn’t enough new material to maintain depth, so the sole stays thin. And if trimming is excessive, removing too much horn reduces the protective cushion and depth, making the sole thinner still. Together, excessive wear, slow horn growth, and excessive trimming directly explain why a sole becomes thin.

Poor nutrition can influence horn quality but isn’t the primary combination of factors used to describe thin soles. Infections can damage hoof tissue but don’t typically define the thinning mechanism. Excessive moisture softens the hoof but doesn’t inherently reduce the sole’s thickness in the same way because it doesn’t reflect the balance of wear and growth or trimming.