Why does my dog have a deep puncture wound after a bite?
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Overview
A bite wound can look like a small puncture on the skin while still going deeper under the surface. That happens because teeth can push through the skin and bruise or damage the tissue underneath. There may be more than one cause, but any deep puncture needs careful checking because it can trap bacteria, swell later or become sore after the first few hours.
Things To Check
1. Look at the wound closely in good light and check whether it is just one hole or several punctures.
2. Check for swelling, redness, heat, discharge, blood, or a bad smell around the bite.
3. See whether your dog is licking, chewing, guarding the area, or reacting when you touch nearby skin.
4. Check if the wound is on the face, neck, chest, belly, legs or near a joint, as these areas can be harder to judge from the outside.
5. Notice whether your dog is bright and comfortable, or whether they seem subdued, painful or off their food.
6. Look for signs the skin has been torn or that there may be a pocket under the surface rather than a neat small hole.
7. Think about when the bite happened, because swelling, infection signs or discomfort can build over several hours.
Common Causes
The most common reason is that a dog tooth has made a puncture into the skin and carried bacteria into the deeper tissue. Even if the surface looks small, the deeper part of the wound can be more significant.
Sometimes the skin closes over the top quickly, which can hide damage underneath and make the area look less serious at first.
Bruising and soft tissue damage around the bite can also make the wound appear deeper than it first seemed.
Less commonly, a puncture wound may be linked with a deeper pocket of infection, a tear that is larger beneath the skin, or damage close to a joint or body cavity.
What To Do
Keep your dog calm and stop them licking or scratching the area if you can. Gently check the wound, but don't probe it or try to squeeze it.
If the skin is only lightly contaminated, you can carefully clean around the outside with saline or clean lukewarm water. Avoid harsh solutions unless your vet has already advised them.
Watch for swelling, heat, discharge or increased pain over the next day, because bite wounds can change after the first injury.
Keep your dog indoors or quiet for now if the wound is on a limb or near a moving area, as activity can make it harder to judge how sore it is.
Products That May Help
Keeping the area clean and checking it regularly is often the main part of home care for minor skin wounds and bite marks.
Related Questions
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Should I clean my dog’s bite wound at home?
Why does a bite wound look small but get worse later?
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.