As soon as we suspected PSSM2, we put Mac on the known protocol to help alleviate the symptoms. This included a combination of management, movement, and nutritional support aimed at keeping his muscles healthy and functioning well.
Rugging
Mac was rugged in wet, windy, or cold weather — generally at temperatures below 10°C, following recommended guidelines. Horses with PSSM2 often have difficulty regulating their muscles in the cold, so keeping him warm helped reduce muscular stress and tightness.
Turnout
We gave Mac as much turnout as possible — but on restricted grazing. I set up a track system around the edge of the field using electric fencing to limit his access to grass while encouraging movement throughout the day.
Daily Movement
Regular, gentle exercise is essential for horses with PSSM2. Mac was given at least 30 minutes of movement daily, either through ridden work or hand walking. This helped maintain circulation and muscle elasticity while reducing the risk of stiffness and tying-up episodes.
Nutritional Support
We added high-quality supplements specifically chosen to support muscle health and function:
- Amino Acids
Amino acids are the building blocks of protein, which is critical for muscle repair and maintenance. Horses with PSSM2 often benefit from additional amino acids to support healthy muscle metabolism and reduce muscle fatigue. - Natural Vitamin E
Vitamin E is a powerful antioxidant that protects muscle cells from oxidative stress and damage. Natural (d-alpha-tocopherol) vitamin E is more bioavailable than synthetic forms and helps reduce inflammation and support recovery after exercise. - Magnesium Glycinate
Magnesium plays a vital role in muscle relaxation and nerve function. We used the glycinate form because it’s more easily absorbed and gentle on the digestive system. It helped reduce tension and muscle cramps, which can be common in horses with PSSM2.
Important: Everything we did for Mac was carried out under supervision and based on extensive research. This is simply the approach that worked for our horse, based on his specific needs and response to management. I am not offering medical advice or suggesting that others follow the same plan. If you suspect your horse may have PSSM2 or a similar condition, I encourage you to do your own research and consult with a qualified equine nutritionist to develop a plan tailored to your horse.
Mac and Me 