Caring for Your Senior Horse

At what age is a horse considered geriatric or senior? Does owning a senior horse mean that he must eat a feed labeled as a “senior” feed? As always, the answer is, it depends. Our horses are living longer lives than ever, thanks to an evolving understanding of the needs of geriatric horses and our ability to provide high quality care. There is no set age cutoff as to when a horse is considered geriatric, but most experts agree this can be around age 20. However, age is just a number, and many horses are still active and competing into their twenties, while others are happily retired. The main issues we see in our older horse population include dental disease, altered dietary needs, metabolic disease/PPID (Cushings), and arthritis.

 

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Dental Changes

The ideal time to begin focusing on your horse’s regular preventative veterinary care is when he is young. Horses receiving regular preventative care, especially veterinary dentistry, preserve their teeth longer and can age more gracefully. Waiting until signs of dental disease or difficulty chewing are observed often indicates advanced disease and more limited treatment options. Most horses benefit from yearly dentistry, which includes a thorough sedated oral exam with a dental speculum, light source, and mirror. A thorough oral exam is vital to accurately assess, document, and treat any issues.

Horses suffering from abnormal dental wear, cracked or missing teeth, or severe periodontal disease may require more frequent care. Even though horse teeth are described as “long rooted,” they do eventually wear out, so proper care ensures the longest possible life of the tooth. Common dental issues in older horses include fracture of cheek teeth, complete expiration or wearing out of cheek teeth, loose/painful teeth, and periodontal disease. The incisors can also be affected by similar conditions.

Staying on top of your senior horse’s dental care helps ensure that he gets what is needed from his diet. Sometimes severe dental disease and impaired chewing ability necessitates eliminating hay from the diet entirely. Complete feeds are formulated specifically for horses that can no longer chew hay effectively. These diets have greatly improved the quality and length of life for senior horses with compromised teeth.

Nutritional Changes

Nutrition recommendations for the geriatric horse are formulated around maintaining an ideal body condition. In the geriatric horse, this can be complicated by difficulty chewing, poor teeth, metabolic disease, and decreased ability to digest fiber and protein. For older horses in good weight and with adequate dentition, little dietary change may be required. For older horses who have difficulty maintaining weight and/or compromised teeth, complete feeds as mentioned above can help. These feeds are high in easily digestible fat, fiber, and protein, and are designed as easy-to-chew. They are formulated to replace hay entirely for those horses that can no longer adequately chew hay.
Adding water to soften the feed can reduce the risk of choke and ensure additional water intake. Feeding recommendations are often listed as pounds of feed per day depending on whether the horse is also eating hay, so it is important to weigh out your horse’s portion so that any necessary adjustments can be made more accurately.

Metabolic Changes

A curly haircoat and muscle loss over the back aren’t just signs of aging- They can indicate a common underlying condition: equine pars pituitary intermedia dysfunction, more commonly known as PPID or Cushings disease. This is a treatable (but not cureable) condition that is very common in geriatric horses, resulting in hormonal imbalances and symptoms such as delayed shedding, curly hair coat, muscle loss over topline, increased drinking and urinating, personality changes, and increased susceptibility to infections and laminitis. Diagnosis is made by a blood test as well as by history and clinical signs. Management involves daily administration of pergolide (Prascend) tablets, which help restore normal hormone levels and alleviate the clinical signs of the disease.

Equine Metabolic Syndrome (EMS) is a separate metabolic condition, but it sometimes occurs in conjunction with PPID. EMS horses typically show signs of being an “easy keeper”- cresty neck, regional fat deposits behind the shoulders and at the tail head. Horses with EMS are more susceptible to laminitis and usually have a higher baseline insulin level than normal. EMS horses are managed with strict attention to diet (minimizing sugar and starch) and exercise to help them maintain a lean body weight.

Joint and Muscle Changes

Just like us, aging horses suffer from daily aches and pains. An examination with your vet can help identify major and minor issues and

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determine what treatment plan works best for you and your horse. Many options are available to keep our old horses comfortable.
Nutraceuticals (supplements) are very popular, although many of these products lack proof of efficacy and ingredients. More researched options include medications such as adequan (administered intramuscularly) and Legend (administered intravenously). These medications help provide the components necessary to keep joints healthy.

Joint injections target individual joints to reduce pain and inflammation and improve mobility. Non-steroidal anti-inflammatories such as Equioxx are also helpful, along with acupuncture and chiropractic care. Stable management is equally important- maximum turn out time allows horses to move at will, and monitoring herd dynamics ensures that older horses are not prevented from accessing food and water. In addition to these considerations, regular veterinary and farrier care will help your senior horse enjoy his golden years with you.

As always, if you have any questions about caring for your senior horse, please contact your veterinarian who can offer a personalized plan to help keep your geriatric horse happy, healthy, and comfortable well into their senior years.

Joint Injections: The what, when and why of intraarticular medications

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Arthritis is one of the most common joint diseases found in the equine industry.  It is the leading factor of decreased performance and chronic lameness in our equine partners and is the source of much frustration and consternation.  The insidious nature of the process means that we as horseman don’t always catch it in the early stages, and instead, are left dealing with the disease in more moderate to advanced situations.  In a previous blog we’ve focused on how to prolong the onset of arthritis by using systemic nutraceutical or injectable products like Cosequin and Adequan (you can find that post here).  This article will focus on the options available to us when these initial attempts against arthritis are no longer efficacious.

What happens during a joint injection?

Once our systemic therapies like Adequan and Legend have no longer proven to be effective in reducing joint pain associated with arthritis, we turn to localized treatment directly within the damaged joint.  Prior to injecting any joints, your veterinarian will perform a thorough lameness exam to isolate the joint(s) from which the lameness is originating.  From there, we as veterinarians prefer to obtain radiographs of the joint in question.  This provides us both a baseline for future assessments as well as a better opportunity to understand any changes to the diseased joint that may alter our approach to needle placement.  The information obtained from the radiograph enables us to give our clients a more accurate prognosis for both post-injection soundness and duration of efficacy of the injection.

Preventing joint infection

Once you and your veterinarian have agreed to inject a joint(s), your veterinarian will then display an odd set of behaviors in which they tirelessly seek out the ideal location to perform an injection.  The biggest risk associated with a joint injection is infection, so we tend to be pretty picky about when and how we inject.  We avoid all windy situations, including drafts, as it seems just as you place the needle into the joint, a large gust of wind comes along and stirs up dust and debris which could potentially contaminate the joint.  We also avoid injecting horses with wet mud/manure directly over and surrounding the site of injection.  Clean, dry legs are necessary. We avoid areas of high traffic, as all it takes is an unknowing rider or the sneeze of a horse to contaminate our sterile site.

The ideal environment for a joint injection is one that has clean, dry footing (rubber mats or concrete work best), that is enclosed to restrict

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or prevent airflow.  Fewer birds in the overhead peanut gallery is also preferred!  If these requirements cannot be found, don’t be surprised if your vet chooses to reschedule for a calmer/dryer day or you’re asked to relocate to a more ideal location.  At the end of the day, a joint infection can be life altering so we strive to avoid those at all costs!

The injection process itself is also sterile.  We will relocate all sources of potential contamination (tails, lead ropes, etc.) and will usually clip the injection site.  All joint injections are preceded with a 12-minute sterile scrub, and all products used in the injection process are also sterile, including your vet’s gloves!  Most practitioners will also use a small amount of antibiotic within the injection itself to further reduce the risk of infection.

What exactly is injected into the joint? 

As mentioned before, there is a small amount of antibiotic that is included in every injection, but beyond that, there is significant variability.  Larger volume joints (think coffin joints, knees, stifles, fetlocks) usually receive a high molecular weight hyaluronic acid (HA) and possibly steroids.  The steroids work to decrease the pre-existing inflammation within the joint and the HA helps bring healthy components into the area to improve the overall joint environment.  (There is also a mild anti-inflammatory response associated with HA).  Lower volume joints (pastern joints and the lower hocks) usually just receive steroids and antibiotic, forgoing the HA due to the small volume of joint space available to accommodate the injection.  There are several types of steroids available to use and which steroid we use is dependent on a multitude of factors.  These include high vs low motion joints, age of horse, severity of the intraarticular disease process, and metabolic status of the horse.  Steroids are contraindicated in horses with metabolic disorders which then has us reaching for an alternative – autogenous intraarticular therapies also termed “regenerative medicine.”

Regenerative Medicine Therapies

For those horses with metabolic issues or who no longer respond well to intraarticular steroids, we now have a variety of options for use in their place.  IRAP (interleukin-1 receptor antagonist protein), PRP (platelet rich plasma) and Prostride are all newer, autogenous technologies available to the veterinary industry.  While PRP and ProStride have applications in horses with arthritis, IRAP is far and away the most commonly used.

IRAP is processed directly from your horse’s blood and it works to counteract the interleukin-1 (IL-1) inflammatory protein.  The blood is collected into a special tube that is then incubated for several hours.  During the incubation process, the IRAP molecule is amplified within the sample.  After incubation, the sample is spun in a centrifuge which then separates the red blood cells from the IRAP rich plasma.  The plasma is then divided up into small aliquots to be used during the joint injection process.  Unlike steroids, which usually only require one injection to have a beneficial response, IRAP requires 2-3 injections, separated by 2 weeks in order to deliver similar results.  The IRAP injections usually last an average of 6-8 months, but the duration of efficacy is dependent upon a multitude of factors and is different for every horse.

While arthritis can be a difficult condition to overcome, rest assured that we do have a large variety of therapeutic options to pursue.  Please don’t hesitate to reach out with additional questions or concerns the next time you see one of us at your barn.  We’re always happy to help you and your horse!