What should I check if my horse has filled legs on both sides?

Read time: 3 minutes

Overview

If your horse has filled legs on both sides, the first things to check are whether the swelling is soft or firm, whether the legs feel hot, whether your horse is lame, and whether there are any cuts, mud fever signs or other skin changes. In many horses, bilateral filling can be linked to standing around, less movement than usual, turnout, muddy conditions or a mild fluid build-up, but there can be several possible causes.

It’s worth looking at the whole picture rather than the swelling alone. A horse that is bright, comfortable and moving normally is often dealing with something less urgent than a horse that is sore, dull or getting worse.

Things To Check

1. Check whether the swelling is on both forelegs, both hind legs, or all four, and whether it is even or more noticeable in one area.

2. Feel the legs for heat, tenderness or pitting, and notice whether the swelling goes down after exercise or gentle movement.

3. Look closely at the skin for cuts, scabs, mud fever, insect bites, discharge or any break in the hair and skin.

4. Watch your horse walk and turn on a firm, level surface to see if there is any stiffness, shortened stride or obvious lameness.

5. Think about recent changes in turnout, box rest, travel, clipping, feed or workload, as these can all affect leg filling.

6. Check the stable or field conditions, especially whether your horse has been standing in wet mud, on deep bedding or with limited room to move.

7. Notice whether the swelling is new, recurring or present after certain routines such as overnight stabling, long transport or a quiet day in the field.

Common Causes

The most common cause is simple stocking up, where fluid collects in the lower legs after standing still for a while. This is often seen after box rest, travel or reduced movement.

Mild soft-tissue irritation or strain can also cause filling, especially if your horse has done more work than usual or has been turned out on uneven or muddy ground.

Skin irritation, small knocks, mud fever or insect bites can sometimes lead to swelling on both sides, particularly if the legs have been exposed to wet, dirty conditions.

Less commonly, filled legs may be linked to a more significant injury, infection or an underlying health issue, especially if the swelling is persistent, hot, painful or affecting your horse’s way of going.

What To Do

Start by comparing both sides and noting whether the swelling improves with gentle exercise. If your horse is otherwise well and moving normally, a short period of controlled movement may help the fluid shift.

Keep an eye on the legs over the next 24 hours and note any changes in heat, comfort or swelling size. If the filling keeps returning, it may help to look at turnout time, stable time, bedding, travel and workload to see what pattern is involved.

Make sure the legs are clean and dry, and check for any minor skin damage that could be adding to the problem. If your horse is muddy, handle the legs gently and avoid rough scrubbing that could irritate the skin further.

If the swelling is not improving, is getting worse, or your horse seems sore or unwell, veterinary advice is sensible.

When To Contact A Vet

Contact your vet if the filled legs are hot, painful, uneven, or accompanied by lameness, fever, dullness or obvious skin infection. You should also get advice if the swelling appears suddenly, keeps returning, or doesn’t improve with normal movement and routine care.

Products That May Help

If your horse is dealing with filled legs, keeping on top of mud, turnout mess and routine leg care can be helpful as part of day-to-day management.

Hoof, Leg & Mud Care

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