Why is my horse’s wound producing thick pus?
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Overview
Thick pus from a horse wound usually means the area is inflamed and may be infected. It can also happen if a wound is dirty, has been closed over too quickly, or is not draining well. You can often check a few practical things at home, but thick pus is a sign the wound needs close attention.
Things To Check
1. Note how much discharge there is and what it looks like, including whether it is thick, yellow, green, creamy or has a strong smell.
2. Check whether the skin around the wound is red, swollen, hot, painful or getting worse.
3. Look for heat, lameness, stiffness or a change in how your horse is moving.
4. See whether the wound is open and draining, or if it looks sealed at the surface while swelling builds underneath.
5. Think about where the wound is, especially if it is on a leg, near a joint, tendon or hoof, or in a place that keeps getting muddy or dirty.
6. Check whether flies, bedding, mud or tack are likely to be irritating the area.
7. Watch for changes in your horse’s behaviour, such as dullness, reduced appetite or being less willing to move.
Common Causes
The most common reason is a wound infection, where bacteria have entered the broken skin and the body is producing pus as part of its response.
Pus can also build up if dirt, bedding or hair has been trapped in the wound, or if the area has not been kept clean enough for it to drain properly.
Sometimes a wound closes over at the top before the deeper part has settled, which can let discharge collect underneath.
If the wound is on a lower leg, movement, mud and repeated contamination can make it harder for the area to stay clean and heal comfortably.
Less commonly, a foreign body such as a splinter or thorn may be involved, or the wound may be deeper than it first appeared.
What To Do
Keep the area as clean as you reasonably can and avoid picking at scabs or squeezing the wound, as that can make irritation worse.
If the wound is draining, monitor it closely for changes in size, smell, colour and swelling.
Reduce exposure to mud, wet bedding and flies where possible, and keep your horse in the cleanest practical environment until you know how the wound is progressing.
Use sensible hygiene when handling the area and wash your hands and any equipment after contact.
If your horse is comfortable and the wound is minor, short-term monitoring can be helpful, but thick pus should not be ignored if it is increasing or not improving.
When To Contact A Vet
Contact your vet promptly if the wound is deep, over a joint or tendon, on the lower leg, or if the pus is increasing, foul-smelling, or accompanied by swelling, heat or lameness.
You should also get advice sooner if your horse seems unwell, the wound was caused by a bite or puncture, or you are unsure whether the area is draining properly.
Products That May Help
For minor cuts, grazes and general wound hygiene, this collection may be useful as part of your everyday horse care routine.
Related Questions
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Can a horse wound heal with pus?
Why does my horse’s wound smell bad?
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.