What should I do if my horse stocks up after box rest?
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Overview
If your horse stocks up after box rest, the first thing to do is stay calm and check whether the swelling is mild, even, and not hot or painful. In many cases, it’s linked to reduced movement rather than something serious, but it’s still worth keeping a close eye on because there can be several possible causes.
Things To Check
1. Check whether the swelling is in one leg or both, and whether it is even or patchy.
2. Look closely for heat, pain, soreness when touched, or any new lameness.
3. Check for cuts, scabs, mud fever type skin irritation, discharge, or broken skin.
4. Notice whether the swelling improves after a bit of controlled movement or returns after standing still.
5. Check the leg all the way down to the hoof, including the digital pulse if you know how to feel for it.
6. Look at the horse’s overall behaviour, appetite, and whether they seem dull, uncomfortable, or unsettled.
7. Consider whether bedding, stable time, turnout, or recent changes in routine could be affecting movement.
Common Causes
The most common reason for stocking up after box rest is simple fluid build-up from standing still for too long. Horses are meant to move, and reduced movement can make the lower legs fill, especially overnight or after longer periods in the stable.
Less commonly, swelling may be linked to a minor knock, skin irritation, or a low-grade infection if there is broken skin. If the swelling is only in one leg, feels hot, or comes with pain or lameness, that needs more attention.
In some cases, stocking up can also be made worse by poor drainage, very little turnout, or an underlying leg problem that needs a vet’s assessment.
What To Do
Start with gentle, sensible movement if your horse is otherwise well and the legs are not hot or sore. Controlled walking, turnout if suitable, and a return to a more regular routine often help more than complete inactivity.
Keep the legs clean and dry, and check them daily so you can spot any change early. If your horse is stable-bound for longer periods, try to reduce the amount of time they are standing still and make sure bedding and routine support easy movement.
It can also help to keep a simple note of when the stocking up happens, how quickly it settles, and whether it is getting better or worse. That makes it easier to judge whether it is just a management issue or something that needs a vet.
When To Contact A Vet
Contact your vet if the swelling is hot, painful, uneven, worsening, or comes with lameness, fever, discharge, or a wound. You should also get advice if it doesn’t improve with normal movement, or if your horse seems unwell in themselves.
Products That May Help
If your horse is prone to filled legs or needs regular leg and mud care, this collection may help support a tidy, consistent routine alongside turnout and movement management.
Related Questions
Why does my horse stock up overnight?
How do I tell stocking up from leg swelling that needs a vet?
Can turnout help a horse that stocks up after box rest?
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.