Managing a Horse With Chronic Ulcers

Chronic ulcers in horses are a significant health concern that affects quality of life, performance, and overall well-being. Whether your horse is experiencing gastric ulcers, colonic ulcers, or oral ulcers, managing this condition requires a comprehensive approach combining veterinary care, dietary adjustments, environmental modifications, and sometimes medical intervention. This guide will help you understand the causes, recognize symptoms, and implement practical management strategies to support your horse’s recovery and prevent recurrence.

Horse owners often feel overwhelmed when faced with a diagnosis of chronic ulcers because the condition is multifactorial and requires ongoing attention. The good news is that with proper management, many horses with chronic ulcers can experience significant improvement and return to normal activities. Understanding the underlying causes specific to your horse is the first step toward developing an effective long-term management plan.

Understanding Chronic Ulcers in Horses

Chronic ulcers develop when the protective mechanisms of the gastrointestinal tract are compromised, allowing stomach acid or colonic contents to damage the tissue lining. Unlike acute ulcers that develop suddenly, chronic ulcers persist for weeks, months, or even years without proper management. In horses, the most common types are equine gastric ulcer syndrome (EGUS), which includes both squamous gastric ulcers and glandular ulcers, colonic ulcers, and duodenal ulcers.

The equine stomach is unique in that it produces acid continuously throughout the day, even when the horse is not eating. The upper portion of the stomach (squamous mucosa) has little protection against acid, while the lower portion (glandular mucosa) is more resistant. Chronic ulceration occurs when this balance is disrupted by stress, diet, medications, or underlying digestive dysfunction.

Risk Factors and Underlying Causes

Several factors increase the likelihood of developing chronic ulcers. High-grain diets, frequent stall confinement, stress from competition or training, use of nonsteroidal anti-inflammatory drugs (NSAIDs), and parasitic infections are all significant contributors. Horses fed large meals infrequently experience prolonged periods without buffering food in the stomach, leaving the mucosa exposed to acid. Performance horses undergoing intense training have elevated stress hormones that suppress stomach acid neutralization and mucus production.

• High-grain, low-forage diets
• Extended periods without feed (more than 4 hours)
• Stress from training, competition, or environmental changes
• Regular NSAID use for pain management
• Poor quality hay or moldy feed
• Gastric reflux or impaired stomach emptying
• History of colic or digestive upset

Recognizing Signs of Chronic Ulcers

Horses with chronic ulcers display a range of behavioral and physical signs that vary depending on ulcer severity and location. Not all horses show the same symptoms, and some may have severe ulcers with relatively mild signs. Learning to recognize the subtle changes in your horse’s behavior and performance is crucial for early detection.

Behavioral and Performance Changes

Many horses with chronic ulcers become irritable, anxious, or resistant to work. You may notice your horse displaying aggressive behavior during grooming or saddling, refusing to move forward under saddle, or showing excessive spookiness. Some horses develop learned behaviors like windsucking or cribbing as a response to discomfort. A previously well-behaved horse may become difficult to ride, buck more frequently, or show reluctance to engage in activities it previously enjoyed.

Physical and Digestive Symptoms

Weight loss is one of the most common signs, occurring even when a horse is being fed adequately. A dull, rough coat that fails to improve with good nutrition may indicate underlying gastric inflammation. Recurring mild colic, intermittent diarrhea or loose stools, and decreased appetite are frequently reported. Some horses appear uncomfortable after eating and may eat slowly or drop feed from their mouths. Teeth grinding, excessive salivation, and a tucked-up appearance around the flank are additional indicators.

Diagnosis and Veterinary Assessment

Definitive diagnosis of chronic ulcers requires veterinary examination and diagnostic imaging. A gastroscopic examination, in which a endoscope is passed through the nostril to visualize the stomach, is the gold standard for gastric ulcer diagnosis. Your veterinarian will assess the extent, location, and severity of ulceration using a grading scale. For colonic ulcers, colonoscopy or biopsies may be necessary, though these are less commonly performed.

It is essential to consult an equine veterinarian before beginning treatment, as proper diagnosis determines the most effective management strategy. This article provides general guidance but is not a substitute for professional veterinary diagnosis and treatment recommendations tailored to your specific horse.

Medical Management of Chronic Ulcers

Medical treatment typically focuses on reducing stomach acid production and protecting the damaged mucosa. Several medications are available, each with different mechanisms of action and effectiveness rates.

Acid-Reducing Medications

Omeprazole, a proton pump inhibitor, is the most commonly prescribed medication for equine gastric ulcers. It dramatically reduces gastric acid production and allows the mucosa to heal. Typical dosing is 1 mg per kilogram of body weight given orally once daily, usually in the morning. Most horses require 4 to 12 weeks of treatment for ulcers to heal completely, though some chronic cases require longer therapy. Omeprazole is available as a paste, powder, or compounded liquid formulation.

Histamine-2 (H2) receptor antagonists like ranitidine were historically used but are less effective than omeprazole for healing ulcers, though they may be used as adjunctive therapy. These medications are typically used for shorter periods and provide less complete acid suppression.

Mucosal Protectants

Sucralfate is a mucosal protectant that binds to damaged tissue and creates a barrier against acid and pepsin. It is often used alongside acid-suppressing medications and is particularly useful for protecting the squamous mucosa. Typical dosing is 20 mg per kilogram given three to four times daily. For effectiveness, sucralfate should be given on an empty stomach, ideally 30 minutes before feeding.

Bismuth subsalicylate and other protective compounds may be recommended by your veterinarian as part of a comprehensive treatment protocol.

Treatment Timelines and Expectations

Ulcer Type and Severity	Typical Treatment Duration	Expected Healing Timeline
Mild gastric squamous ulcers	4-6 weeks omeprazole	8-12 weeks complete healing
Moderate gastric ulcers	8-12 weeks omeprazole	12-16 weeks complete healing
Severe or glandular ulcers	12+ weeks omeprazole	16+ weeks or longer
Colonic ulcers	Variable, veterinarian-dependent	8+ weeks depending on severity

Dietary Management for Chronic Ulcers

Diet is one of the most important components of managing chronic ulcers and preventing recurrence. The goal is to maintain continuous buffering of stomach acid, reduce stress on the digestive system, and provide optimal nutrition for healing.

Forage as the Foundation

High-quality hay should be the primary component of your horse’s diet. Horses should consume 1.5 to 2 percent of body weight daily in forage. Unlike grain, hay stimulates saliva production and continuously buffers stomach acid throughout the day. Clean, mold-free hay free from dust is essential, as poor-quality forage can irritate the digestive tract. If your horse has difficulty eating due to dental issues or sensitivity, consider offering soaked hay cubes or hay pellets as an alternative.

Grain and Concentrate Feeding

Minimize or eliminate grain from the diet if possible. If your horse requires caloric supplementation, use low-starch, high-fat concentrates instead of grain-based feeds. Grain increases stomach acid production and gastric acidity, directly contributing to ulcer development and slowing healing. Divide remaining concentrates into multiple small meals throughout the day rather than one or two large meals.

Feeding Schedule and Turnout

Establish a consistent feeding schedule with meals offered at the same times each day. Aim to provide feed at least four to five times daily, with no more than four hours between meals. Ideally, horses should have access to hay throughout the day and night. Increased turnout and grazing time are particularly beneficial because grazing naturally distributes food intake and provides mental stimulation that reduces stress-related ulcer exacerbation.

Supplemental Feeding Support

Alfalfa hay provides higher calcium and buffering capacity than grass hay, making it beneficial for some horses with gastric ulcers. A mixture of alfalfa and grass hay is often ideal. Ensure feed is high quality with no visible mold, dust, or unpleasant odors. Consider adding a source of omega-3 fatty acids, such as ground flaxseed or fish oil, which support mucosal healing and reduce inflammation. Probiotics and prebiotics may support overall digestive health, though evidence is mixed; discuss options with your veterinarian.

Environmental and Lifestyle Management

Beyond medication and diet, managing the horse’s environment and stress levels significantly impacts ulcer healing and prevention of recurrence.

Stall Confinement and Turnout

Increase turnout time as much as safely possible. Horses confined to stalls for extended periods experience elevated stress hormones and have higher gastric acidity. Turnout to pasture allows natural grazing behavior, increases social interaction, and reduces ulcer-related stress. Even four to six hours of daily turnout provides substantial benefit. If full-time turnout is not possible, aim for a minimum of eight hours daily.

Training and Exercise Modifications

During the acute healing phase, reduce training intensity and duration. High-intensity exercise, particularly on a full stomach or shortly after feeding, can exacerbate ulcers. Allow at least 30 minutes to an hour between feeding and vigorous exercise. As the horse improves, gradually increase training intensity while monitoring for behavioral changes that might indicate returning ulcer pain.

Managing Stress and Anxiety

Stress is a major contributor to chronic ulcer development and delays healing. Maintain a consistent routine, minimize sudden environmental changes, and ensure the horse has companionship and herd interaction if possible. Some horses benefit from calming supplements containing magnesium or herbal formulations, though evidence varies. Discuss these options with your veterinarian before implementation.

Monitoring Progress and Adjusting the Plan

Successful management of chronic ulcers requires ongoing monitoring and adjustment of your treatment protocol. Schedule regular veterinary evaluations to assess healing progress and determine when to modify medications or management strategies.

Signs of Improvement

Positive indicators include improved attitude and willingness to work, decreased reactivity during grooming or saddling, weight gain or stabilization, improvement in coat quality, and resolution of colic episodes. Many horses show behavioral improvement before complete healing is evident on gastroscopic examination, so don’t rely solely on clinical signs.

Preventing Recurrence

Once your horse’s ulcers have healed, continue the dietary and management modifications that contributed to improvement. Many horses require long-term or intermittent omeprazole therapy to prevent recurrence, especially those with risk factors that cannot be completely eliminated. Your veterinarian may recommend maintenance therapy at a reduced dose or periodic preventive treatment during stressful periods like competition season.

Common Complications and When to Call Your Veterinarian

While chronic ulcers are generally not immediately life-threatening, complications can develop. Call your veterinarian immediately if your horse shows signs of severe colic with repeated rolling, violent sweating, or complete loss of appetite. Horses with severe ulcer-related bleeding may show dark, tarry stools (melena) or signs of anemia including pale mucous membranes and lethargy. These situations require emergency veterinary evaluation.

If your horse is not improving after four to six weeks of appropriate treatment, or if signs worsen despite therapy, contact your veterinarian to reassess the diagnosis and explore alternative underlying causes. Some horses develop secondary colonic ulceration or have undiagnosed conditions contributing to persistent signs.

Frequently Asked Questions

How long does it take for a horse’s ulcers to heal?

Healing timelines vary depending on ulcer severity and location. Mild gastric ulcers typically heal within 8-12 weeks with appropriate treatment, while moderate to severe ulcers may require 12-16 weeks or longer. Glandular ulcers and colonic ulcers may require extended treatment periods. Consistent adherence to medication, diet, and management strategies is essential for optimal healing timelines.

Can a horse return to work while being treated for ulcers?

Yes, most horses can continue light to moderate exercise during ulcer treatment. However, intensity and duration should be reduced compared to pre-ulcer levels. Allow adequate time after feeding before exercise, and monitor your horse closely for pain behaviors. As healing progresses and your veterinarian confirms improvement, gradually increase training intensity. Horses undergoing high-intensity performance work may require longer healing periods before returning to previous levels.

Is omeprazole safe for long-term use in horses?

Omeprazole is considered safe for long-term use in horses and is regularly prescribed for both treatment and prevention of gastric ulcers. Long-term use does not cause significant adverse effects in equines. However, cost is a practical consideration for extended therapy. Your veterinarian may recommend a maintenance protocol at a lower dose after initial healing is achieved to prevent recurrence, particularly in horses with ongoing risk factors.

What is the difference between gastric and colonic ulcers?

Gastric ulcers occur in the stomach, particularly in the squamous mucosa of the upper stomach, and are more commonly diagnosed. Colonic ulcers affect the large intestine and are less frequently diagnosed, partially because they require colonoscopy for definitive diagnosis. Colonic ulcers may cause similar signs including weight loss and behavioral changes but also frequently present with diarrhea. Treatment approaches differ, and your veterinarian will determine the appropriate diagnostic approach based on your horse’s clinical signs.

Can dietary changes alone heal chronic ulcers without medication?

Dietary and management modifications are essential components of ulcer treatment, but they are rarely sufficient alone for healing established chronic ulcers. Most horses require acid-suppressing medication like omeprazole to achieve complete healing within a reasonable timeframe. However, once healed, excellent dietary and management practices are critical for preventing recurrence and may reduce or eliminate the need for ongoing medication.

Key Takeaways

• Chronic ulcers in horses require a comprehensive approach combining veterinary care, medication, dietary management, and lifestyle modifications for successful healing and prevention of recurrence.
• Definitive diagnosis of chronic ulcers requires veterinary examination and gastroscopic evaluation; consult an equine veterinarian before beginning treatment rather than relying on assumptions about ulcer presence.
• Omeprazole is the most effective medication for healing gastric ulcers, typically requiring 4-12 weeks of therapy; healing timelines vary based on severity and compliance with management protocols.
• Diet should emphasize high-quality forage, minimize grain, and include frequent small meals throughout the day to continuously buffer stomach acid and reduce ulcer-related pain.
• Increased turnout, reduced stall confinement, and stress management are critical environmental modifications that directly support healing and reduce recurrence risk in horses with chronic ulcers.
• Monitor your horse’s progress regularly and work with your veterinarian to adjust treatment protocols as healing occurs and to establish long-term prevention strategies specific to your horse’s risk factors.