Why does my horse have stocking up in both hind legs?
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Overview
Stocking up in both hind legs usually means there’s mild fluid build-up, often from standing still, reduced movement, or being on box rest. It can look concerning, but in many horses it settles once they move about more and the legs are checked for anything else unusual.
It’s still worth looking closely, because both hind legs can fill for several different reasons and not all of them are simply “normal”.
Things To Check
1. Check whether the filling is worse first thing in the morning, after a long stable period, or after travelling.
2. Feel both hind legs for heat, and compare them with the front legs as well as each other.
3. Look for any cut, scrape, mud irritation, scab, or puncture that could explain the swelling.
4. Check whether the swelling goes down after turnout, hand-walking, or normal exercise.
5. Watch how your horse is moving and note any stiffness, short strides, or unevenness.
6. Consider whether the horse has had less turnout, less exercise, recent box rest, or a change in routine.
7. Look at the hind legs from behind to see if the swelling is soft and even, or if one area is more obvious than another.
Common Causes
The most common cause is reduced movement. Horses that stand in for long periods, travel, or have limited turnout may collect a bit of fluid in the lower legs.
Soft, even swelling in both hind legs can also happen after a quiet night in the stable, especially in horses that are otherwise well and moving normally.
Mud, minor skin irritation, or a small knock can sometimes make filling more noticeable, even if the horse doesn’t seem very sore.
Less commonly, both hind legs may fill because of an underlying issue that needs attention, especially if the legs are hot, painful, or the horse is not moving normally.
What To Do
Start by checking the horse again after a little movement. Many horses improve once they are out, walking, or back into a normal routine.
Keep an eye on whether the swelling is soft, even, and settled, or whether it is increasing, firm, hot, or linked to lameness.
If your horse is stabled for long periods, think about whether turnout, more frequent walking, or a less static routine might help reduce the filling.
Check the legs and surrounding skin daily, especially in wet or muddy conditions, so you can spot small changes early.
If the filling keeps coming back, note when it happens, how quickly it settles, and whether anything in the horse’s routine seems to trigger it. That information is useful if you do need veterinary advice.
When To Contact A Vet
Contact your vet if the swelling is sudden, very warm, painful, or doesn’t improve with movement. You should also get advice if your horse is lame, the legs are getting worse, or there’s a wound, discharge, or general unwellness alongside the filling.
If the problem keeps recurring or you’re not sure whether it’s simple stocking up, it’s sensible to ask your vet to check it.
Products That May Help
If your horse is prone to filled legs, keeping up a simple daily leg and mud-care routine can be useful, especially after turnout or standing in. This collection may help support that regular management.
Related Questions
Why do my horse’s hind legs fill more overnight?
How can I tell the difference between stocking up and an injury?
Is stocking up in horses ever normal?
Atlas is here to support owners with practical, easy-to-understand guidance. It is not a substitute for professional veterinary advice. If you're concerned about your animal's health, symptoms worsen, or something doesn't feel right, contact your vet.