Why is my mustang stocking up in his legs? The most common reason is reduced movement. When a mustang stands still for many hours, fluid accumulates in the lower legs, causing puffiness. This is especially common in stabled horses or those with limited turnout.
What is Stocking Up?
Stocking up is a non-painful, symmetric swelling of both hind legs (or all four) that occurs when a horse stands for long periods. The swelling is due to gravity pulling fluid into the tissues, and the lack of movement fails to pump it back. It’s not lameness or infection. A mustang that is used to roaming may stock up more if confined.
Common Causes in Mustangs
Stalling or Confinement
Mustangs are built to move. If kept in a stall or small pen for more than a few hours, they often stock up. The swelling usually goes down after they are turned out or exercised.
Diet Changes
A sudden increase in grain or rich hay can cause mild fluid retention. Mustangs on pasture with lush grass might also show mild stocking up. Ensure a balanced diet with proper minerals.
Old Age or Arthritis
Older mustangs or those with hock arthritis may stock up because they move less. Arthritis pain can reduce activity, leading to fluid pooling. Always have a vet evaluate if lameness is present.
Weather Changes
In cold weather, horses may stand more to conserve energy. Heat can also cause minor swelling. These are usually temporary.
Differentiating Stocking Up from Injury
Stocking up is symmetrical – both legs look similar. The swelling is cool, not hot, and the horse is not lame. If one leg is more swollen, hot, or your mustang is limping, it could be an injury, infection, or lymphangitis. Check for wounds or heat. Consult a vet if unsure.
How to Prevent and Manage Stocking Up
The best prevention is daily movement: turnout in a large paddock or pasture, hand walking, or light riding. If stalling is necessary, increase turnout time. Other tips:
– Provide a dry, cushioned stall floor (not deep shavings that restrict leg movement).
– Massage legs before and after exercise.
– Use stable bandages if your mustang must stand for hours, but apply carefully.
– Ensure a balanced diet with adequate electrolytes (consult an equine nutritionist).
– In winter, use leg wraps to keep legs warm and encourage circulation.
When to Call a Vet
Contact a veterinarian if:
– Swelling is hot, painful, or only in one leg.
– Your mustang is lame or has a fever.
– Swelling does not go down after exercise or turnout.
– There is pitting edema (press finger into swelling, dent remains).
– Stocking up persists despite increased movement.
– You notice any open sores, scabs, or crusting.
A vet may check for infection, cellulitis, or heart problems.
Summary
Stocking up is normal for a mustang that stands still too long. Increase movement first. If swelling persists or is one-sided, always consult a vet.
Key Takeaway
If your mustang’s legs are puffy but not hot or lame, the likely culprit is reduced movement – increase turnout or hand walking first, and consult a vet if swelling is one-sided or persistent.