Why is the skin around my dog’s wound dark or discoloured?
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Overview
Dark or discoloured skin around a dog’s wound can be caused by bruising, inflammation, scabbing, dried blood, pressure from swelling, or infection. It doesn’t always mean something serious, but it does mean the area is worth checking carefully.
If the skin is getting darker, the wound looks more painful, or there’s discharge, heat, swelling or a bad smell, it’s sensible to get veterinary advice.
Things To Check
1. Check whether the colour change is new or whether it has been there since the injury happened.
2. Look closely for redness, swelling, heat, scabs, broken skin or any discharge.
3. Notice whether your dog is licking, biting or scratching the area more than usual.
4. Check if the wound seems more painful, tender or sensitive when touched nearby.
5. See whether the skin looks black, very purple, greyish or patchy rather than just mildly bruised.
6. Watch for a smell from the wound, as well as wetness or staining on the fur.
7. Think about whether the wound may have been rubbed by a collar, harness, bandage or bedding.
Common Causes
Bruising is one of the most common reasons for darker skin around a wound, especially after a knock, bite or scrape.
Scabbing and dried blood can also make the skin look dark while the area is healing.
Inflammation or swelling may change the way the skin looks, especially if the wound is irritated or your dog has been licking it.
Infection can sometimes cause colour change along with heat, redness, discharge or a smell.
Less commonly, darker skin can happen if the tissue has been under pressure, has poor blood supply, or has reacted badly to rubbing or bandaging.
What To Do
Keep the area clean and dry unless your vet has already told you to do something different.
Try to stop licking or scratching, as that can make the skin look worse and slow healing.
Monitor the wound at least once or twice a day so you can spot changes in colour, size, swelling or discharge.
Use a clean, calm environment and avoid anything that may rub the area, such as tight harnesses or rough bedding.
If you’re unsure whether the colour is bruising, scabbing or something more concerning, it’s sensible to ask your vet to check it.
When To Contact A Vet
Contact your vet if the dark or discoloured skin is spreading, the wound is getting more swollen or painful, or there’s discharge, heat or a bad smell. You should also get advice if the skin looks black or grey, your dog seems unwell, or the wound isn’t improving over a day or two.
Related Questions
Why does my dog’s wound keep scabbing over?
Should I clean my dog’s wound at home?
How can I stop my dog licking a wound?
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.