Why is pus coming from my dog’s wound?
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Overview
Pus coming from a dog’s wound usually means the area is inflamed and may be infected, or that the wound is trying to drain trapped fluid, dirt or damaged tissue. It’s not something to ignore, but it doesn’t always mean the worst. The wound may simply need proper cleaning, protection and a vet check if it’s not settling.
Things To Check
1. Look at the colour and amount of discharge. Thick yellow, green or creamy fluid is more concerning than a small amount of clear or blood-stained fluid.
2. Check for redness, heat, swelling or a bad smell around the wound.
3. See whether your dog is licking, chewing or scratching at it, as this can keep the wound irritated.
4. Check if the wound is open, deep, gaping, punctured or has anything visible inside it.
5. Notice whether your dog seems sore, is moving less, or is reluctant to let you touch the area.
6. Think about when it started and whether it has been getting worse rather than better over a day or two.
7. Look for general signs your dog isn’t quite right, such as being quieter than usual, off food, or a raised temperature.
Common Causes
The most common cause is a bacterial infection in the wound. This can happen when the skin barrier is broken and bacteria get in.
Sometimes a bite, puncture or thorn can leave a small opening on the surface but a deeper pocket underneath, which may trap fluid and form pus.
A wound can also become irritated by licking, dirt, moisture or movement, which can slow healing and lead to discharge.
Less commonly, a retained foreign object, dead tissue or an abscess under the skin may be involved.
What To Do
Prevent licking or chewing if you can, because that often makes the wound harder to heal. Keep the area clean and dry, and avoid using harsh products, creams or antiseptics unless your vet has already told you to.
If the wound is small and superficial, you can gently keep an eye on it for changes in size, smell, discharge and comfort level. If it’s on a paw, belly or another area that gets dirty easily, try to keep your dog out of muddy or dusty areas until it settles.
It’s sensible to arrange a vet check if the pus is increasing, the wound is spreading, your dog seems unwell, or there’s any deep puncture, bite wound or swelling. Wounds that aren’t improving usually need proper assessment.
When To Contact A Vet
Contact your vet promptly if the wound is deep, a bite or puncture wound, or if pus, swelling, pain or redness is getting worse. You should also seek advice if your dog is off food, lethargic, feverish, or the wound has a strong smell or keeps reopening.
Products That May Help
If you’re managing a messy wound, keeping your dog clean and comfortable around the area can make day-to-day care a bit easier while you monitor it.
Related Questions
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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.