Tips for Hoof Cracks and Chips

Many horses develop hoof cracks at some point in their lives. Most are innocuous and resolve themselves with good nutrition and consistent farrier care. But there are many types of hoof cracks, and sometimes you'll need to take extra steps to make sure the crack 'heals' and no new cracks develop. These are serious, and they need to be treated.

As with any horse problem, the first thing you need to ask yourself is "why is this problem happening?" Because horse's hooves grow at a slow rate, about one centimeter (slightly less than 1/2 inch) per month, hoof cracks can take a long time to grow out once they get started. Finding the answer to the question is less time consuming, expensive, and frustrating than just trying different random solutions.

Other Names

Hoof cracks are named for the area of the hoof they are located, or the suspected cause: quarter cracks (full thickness crack often originating at coronary band and progressing distally which may lead to lameness and/or infection); heel cracks, toe cracks, sand cracks (result from injury to the coronary band and may cause lameness); bar cracks, and grass cracks (occur in horses with long unshod hooves).1

Causes

There are many reasons why hoof cracks form. Nutritional deficiencies can cause fine cracks on all four hooves. The hoof walls may be thin or weak, slow-growing, show ridged horizontal rings, and the free edge of the hoof may chip easily.

In very wet or dry conditions hooves can weaken, especially if the horse is exposed to extremes such as wet-then-frozen ground, or wet-then-very-hard, dry surfaces. Some moisture is good for hooves, but continually standing in muddy, wet conditions or soggy bedding and wet manure can make the hoof material expand and weaken.

Hard surfaces can be a problem for horses ridden barefoot over rocky or paved surfaces. Hooves can chip and wear if horses have to travel over these surfaces frequently. Some hoof protection, either a shoe or boot, can help prevent these types of cracks. 
Symptoms

Hoof cracks can travel horizontally or vertically. Horizontal cracks and lines on all four hooves may be a sign of nutritional deficiencies. Short horizontal cracks may indicate a hoof abscess has erupted through the coronet band at the top of the hoof. As the hoof grows out, the crack grows down the hoof. As it reaches the free edge, it may cause the hoof to chip.

If only one foot is affected, nutritional deficiencies can be ruled out. If only the front