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What Causes a Horse to Founder and Can They Recover From It?

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We were told our horse might have foundered. Our grandson saw the concern in our faces and immediately asked, what is founder, and why are you so concerned?

Founder, sometimes called laminitis, can be caused by several things, including diet, genetic predisposition, and overmedicating, Founder usually refers to chronic inflammation of the coffin bone in the horse’s hoof. It is a very serious condition that can result in the horse’s death

Many horse owners don’t understand the causes and critical consequences that flow from founder. You need to know a lot of information to prevent and treat this crippling and painful affliction.

Understanding the anatomy of a horse’s hoof is critical.

Before going into the causes, it’s necessary to understand a bit about the hoof and what happens when laminitis occurs. The saying “no hoof, no horse” is as accurate today as it ever was.

Inside the hoof, there is bone and laminae; the necessary parts that allow the horse to stand and move. If the laminae get inflamed, the horse will become lame on that leg.

Diagram of a horses hoof,

To become what is better known as founder, that inflammation will begin to rotate the coffin bone, causing pain and permanent problems. Therefore, it’s crucial to figure out what caused it.

What causes founder?

Black walnut exposure: If you’ve ever looked around a black walnut tree, you may have noticed that the soil is poor. That’s because the tree, bark, and leaves contain a toxin. Horses are extraordinarily sensitive to this toxin.

If they eat it or it’s part of the shavings in their stalls, they are at risk of developing laminitis. Prolonged exposure will result in chronic laminitis, aka founder. The amount doesn’t have to be great to do this. As little as twenty percent of black walnut shavings can cause this problem.

Breed: Some breeds of horses and ponies are more prone to founder than others. A two-year study done in the U.K. showed that some of the native breeds were more likely to founder than other breeds. Genetics can play a role in deciding what the horse is going to do.

Feed: This is one of the leading causes of founder in new horse owners. Horses have an instinctive need to chew. If they are given too much grain or offered unfettered access to silage, they will eat it all. Overeating itself can do it, but so can the weight gain.

Obesity leads to secondary health issues that all can cause founder. For example, an obese horse is less likely to get enough exercise and develop diabetes, increasing the risk of developing laminitis.

Horses only need grass and hay to live healthily. Overfeeding and feeding a horse incorrectly is more harmful than underfeeding your animal. For example, grain is a good energy source for cold days and when the horse is going to exert itself.

However, too much grain is harmful, and a grain only diet is not the right choice. Having some hay mixed with the grain is much better for your horse. An even better idea is to put forage into a hay net, so the horse eats it slowly.

Some grass, when eaten early in the morning, can also lead to laminitis and founder. This is particularly true if the grass is from a new source. If you want to learn more about the grass horses eat grass, you should read Grass For Horses: Why it’s Essential and the Different Types.

Horses need their feed changed very slowly, and it’s not just to prevent founder. Too swift a change and the horse could develop colic.

If you’re a new horse owner, spend some time reading about equine diets and talk to veterinarians and experienced horsemen. Most should advise you to supplement your horse’s hay or grass if it requires extra energy.

Percussion: There are two ways to look at this. One of them is riding. Riding a horse hard can do lasting damage to the hoof, including causing both acute and chronic laminitis. That doesn’t mean a horse can’t be ridden hard, just that care has to be taken.

The farrier needs to know what kind of riding the horse will be doing. The shoes he or she attaches will differ depending on the horse’s needs. It’s also essential to have an excellent farrier. They can spot the beginnings of laminitis before you do.

The second has to do with shoeing. No matter how good the farrier is, some horses will have some laminitis after shoeing. This is especially true if the length of time between visits is more than eight weeks.

A horse’s hoof is like our fingernails, in a way. They are continually growing. To keep the horse comfortable and provide the stability it needs, they need to be trimmed regularly by someone who knows what they are doing.

For those who believe in a horse going “barefoot,” this is even more important. Horseshoes are used to protect the hoof, much like our shoes protect our feet. Without regular trims, it can cause the horse to stand at an odd angle, leading to… laminitis.

Insulin resistance: Horses are mammals, and like other mammals, can develop something similar to what we humans call diabetes. When insulin can’t turn food into glucose, the muscles suffer. When that happens, the horse is liable to develop laminitis.

Picture of a rider soothing his horse.

If your horse is insulin-resistant, take preemptive measures to reduce the chance it develops laminitis, such as eliminating grains and sweet feed from its diet and exercise the animal as much as possible.

Medications: Steroids and nonsteroidal anti-inflammatory drugs can, over time, cause laminitis. One would think it would have the opposite effect, but overuse is definitely a cause.

The reaction to steroids is even more pronounced when horses are fed a high carbohydrate diet. Scientists found that horses administered steroids after eating a high carbohydrate diet were much more likely to develop laminitis.

Colic surgery: This only happens in one to two percent of the surgeries, although it does happen. However, administering low‐molecular‐weight heparin (LMWH) post colic surgery has proven to be effective in preventing laminitis.

Pregnancy: Both the added weight of the foal and the hormones released during pregnancy can result in laminitis. It may also relate to general biological changes that sometimes cause pregnant horses to be insulin-resistant and thus prone to develop laminitis.

So, what can I do to prevent founder?

Some of the answers are rather obvious. Keep the horses away from black walnut, including shavings, trees, or wood fences made from the tree. Watch the horse’s feed, keep an eye out for weight problems, and make sure the horse has its hooves trimmed regularly.

If your horse is on rich lush pastures use a grazing muzzle. You can click here to read a helpful article about grazing muzzles. In the article I cover the different types of grazing muzzles and when they should be used.

Some are harder to cope with. When it comes to trimming and shoeing, please work with your farrier and your large animal vet to balance its feet. It isn’t necessary to avoid all medications; just make sure they aren’t overused.

Horses can recover from founder.

Acute laminitis can be treated. It may get better; it may not. It depends on the cause, the severity, and the horse. Typically a horse with acute laminitis is given stall rest.

It would be best if you kept your horse in a stall with soft bedding, preferably one with deep pine shavings or good hay to reduce the strain on the hoof.

Chronic laminitis may be treated. Once again, it depends on the cause and the horse. A lot of times, when chronic laminitis is diagnosed, the subject of euthanasia comes up. The question of quality of life over quantity comes in to play.

Chronic laminitis slowly gets worse until the horse can no longer stand because of intense pain. Often the condition will progress to the point that the coffin bone penetrates the sole of the animal’s foot.

When this happens, little can be done to save the horse; the most humane choice is likely to put your companion out of its misery.

However, these decisions are best made after consultation with your vet and farrier. It isn’t an easy choice to make, no matter what sort of furry loved one we have.

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