Horse Illustrated Magazine

This year seemed much like the other 7 years I’d spent in Tennessee, until nearly all the horses I work with, including my own, were walking as though on a bed of nails. I noticed quickly that these stilted and sore gaits were accompanied by pounding pulses and stiffened crests, and knew I was dealing with an influx of laminitis. So, I hung up my riding boots and slipped on my gum shoes, determined to find the source of this affliction. What was causing these horses to have these symptoms? Some of these horses were on pasture, so you may jump to spring grass as the cause, but that’s only part of the answer. Even dry lots, muzzles, and stalls weren’t enough to combat this scourge. A 19 yr old pony confined to a stall and put on meds still had sore feet. A 5 year old Quarter Horse mare had her owner and me scratching our heads. With normal blood work, including a highly functioning thyroid, she was still sore while in a dry lot eating hay. My own 13 year old mare’s right front foot transformed from decent looking to dished and grooved overnight and her other three hooves followed within two weeks. There were others too – trips to my clients’ farms for lessons became laminitis interventions. It was downright depressing!

I went on a mission to better understand what was going, learn how to rehabilitate those affected, and prevent it from ever happening again. I began by looking at changes in the horse’s diets and environments. With my horse, I realized that her laminitis developed after removing the added fiber and fat from her winter diet. Even though I noticed that her neck crest tended to be tight (a sign that a horse is in the midst of a metabolic event), I didn’t make the connection that it was an actual sign of trouble. She wasn’t on any grass and she was underweight – far from a typical presentation of a compromised horse.

I immediately put her back on the “weight-gain” ration. It was playing a more significant role in maintaining her nutritional balance than I had realized. While this slowed her metabolic decline, it took regular tweaking and additional supplementation in her diet to halt the damaging effects, make her comfortable, and let the healing process begin.

“It’s the hot and humid weather we have in the South that makes the grass problematic for some horses,” says Dr. Marc Smith of Natchez Trace Veterinary Services in Franklin, Tennessee. “The grass in this area is predominately fescue and designed to put weight on livestock. It has a high sugar content and an endophyte to which some horses may react. In a horse this reaction is expressed in the feet. It’s like a kid at the fair eating sugary foods all day then getting sick that night.”

Grass, especially in the spring, is widely known to cause trouble, but I was shocked when horses that have no predisposing characteristics were still struggling with laminitis deep into summer. I found out that even a horse who primarily eats hay can still have a metabolic event.

“What’s in the grass is in the hay,” explains Dr. Smith. “Also, once a horse has been metabolically compromised, he’s likely to develop sensitivity and be reactive to any dietary change or imbalance.”

The reason is, says Smith, “When the bacteria in the gut are disturbed, they die and release toxins into the horse’s system and can cause laminitis.” This is in line with my experience. I modified my horses’ diets to combat the effects of the grass, correct nutritional imbalances, and keep their systems stabilized. “While there are some breeds and body types that can be more prone, any horse can be affected, Smith says. Genetics or lifestyle factors such as feed, management, and location can trigger this condition.”

I learned this year that no horse is immune to laminitis. It can strike at any minute of any day from nearly any dietary change or deficiency. Vigilance is key. I check each horse regularly looking for their “tell” that a metabolic event is coming on – a stiff or thickened crest, uneven or shortened gaits, or bounding digital pulse. At the first signs I make immediate changes to diet and/or management. I have become quite good at halting the process and minimizing the damaging effects. Maintaining my horse’s and my client’s horses’ equilibrium takes time and an array of specialized supplements and feed, but that’s what it takes to keep our horses healthy and happy. It’s a new normal – laminitis is on my radar like never before and won’t catch me or my horses off guard again.

Liked this article? Here are others you’ll love:
First Aid for Lamintiis
Ask the Vet: Laminitis Recovery Time
Ask the Vet: Preventing Laminitis

Thanks to Dr. Marc Smith of Natchez Trace Veterinary Services in Franklin, Tennessee for his assistance with this article.