A dog bite can range from a minor scrape to a serious wound, but every bite carries some risk of infection and deserves prompt attention. Even bites that look small on the surface can push bacteria deep into your skin, and the hours right after a bite matter most for preventing complications. Here’s what to expect and what to do.
What to Do Right After a Bite
Your first priority is cleaning the wound thoroughly. Run warm water over the bite for several minutes to flush out bacteria. If the skin is broken, gently wash the area with mild soap. Apply gentle pressure with a clean cloth if it’s bleeding, then cover it with a clean bandage.
For shallow scrapes where the teeth didn’t puncture the skin, home care is often enough. But if the bite broke through the skin, left puncture wounds, or won’t stop bleeding, you should get medical attention the same day. Bites on the hands are especially prone to infection because tendons and joints sit close to the surface. Bites to the face, while they tend to heal well due to strong blood flow, still need professional evaluation for scarring and closure.
How Doctors Decide to Treat the Wound
One thing that surprises many people: dog bites often aren’t stitched closed right away. Closing a bite wound can trap bacteria inside, so doctors frequently leave bites open to drain and heal on their own. The World Health Organization recommends postponing stitches on bite wounds when infection is suspected. Facial bites are more likely to be closed for cosmetic reasons, since the face’s rich blood supply lowers infection risk.
Doctors categorize bites by risk level when deciding on treatment. Factors that push a bite into the high-risk category include:
- Location: bites on the hands, feet, or near joints
- Wound type: deep punctures or crush injuries
- Delayed care: waiting longer than 6 to 12 hours for arm or leg bites, or longer than 12 to 24 hours for facial bites
- Your health: having diabetes, a weakened immune system, or a missing spleen
- Bite near a prosthetic joint
For high-risk wounds, preventive antibiotics are standard. For average-risk wounds, your doctor may prescribe them as a precaution or monitor you closely instead. If you haven’t had a tetanus shot in the past five years and the wound is deep or dirty, you’ll need a booster within 48 hours.
Infection Risk and Warning Signs
Dog mouths carry dozens of bacterial species, and a bite is an efficient delivery system for pushing those bacteria under your skin. Most bites don’t become seriously infected, but the ones that do can escalate quickly. One particularly dangerous bacterium lives in the saliva of most healthy dogs. It rarely causes problems in healthy people, but in certain groups it can enter the bloodstream and cause sepsis.
You’re at higher risk for serious infection if you have a weakened immune system from conditions like cancer, diabetes, or HIV; if you’re on medications like chemotherapy that suppress your immune response; if you’ve had your spleen removed; or if you have an alcohol use disorder.
Watch the bite closely for the first two weeks. Signs of infection include:
- Increasing redness, swelling, or warmth around the wound
- Pain that gets worse instead of better
- Pus or fluid draining from the bite
- A fever of 100.4°F (38°C) or higher
- Red streaks spreading outward from the wound along the skin
- Swollen glands in your neck, armpits, or groin
- Blisters forming near the bite
Other symptoms that point to a spreading infection include diarrhea, vomiting, headache, confusion, and muscle or joint pain. Any of these within 14 days of a bite warrant immediate medical attention.
Rabies: When It’s a Concern
Rabies is rare in pet dogs in the United States, but it’s nearly always fatal once symptoms appear, so it’s taken seriously after every bite. Whether you need rabies treatment depends on the circumstances: Was the dog a stray or a pet? Is the dog’s vaccination status known? Was the bite provoked or unprovoked?
If the dog is a healthy, vaccinated pet, animal control will typically place it under a 10-day observation period. If the dog shows no signs of illness during those 10 days, rabies is ruled out. If the dog is a stray, can’t be found, or is acting strangely, your doctor and public health officials will likely recommend starting rabies treatment right away.
Rabies treatment for someone who has never been vaccinated involves two components: an injection of antibodies given once at the start (ideally around the wound itself) and a series of four vaccine doses spread over two weeks, on days 0, 3, 7, and 14. People with weakened immune systems get a fifth dose on day 28. There are no contraindications to rabies treatment. It’s safe for pregnant women, infants, and children. If you’ve been previously vaccinated against rabies, you only need two vaccine doses and no antibody injection.
How Bite Severity Is Classified
Not all bites are the same, and professionals use a six-level scale to describe what happened. At the mildest end, a dog may snap without making skin contact, which is still a warning sign of aggression but leaves no physical injury. The next level involves skin contact without puncture, possibly leaving small scrapes. Level 3 bites cause one to four shallow puncture wounds from a single bite. Level 4 bites are deeper, with punctures that go further into tissue, often with bruising from the dog shaking or holding on. Levels 5 and 6 involve multiple severe bites or fatal injuries.
This scale matters because it helps predict healing time and infection risk. A shallow scrape heals differently than a deep puncture that has driven bacteria into muscle or near bone. Deep puncture wounds are particularly deceptive since the entry point can look small while the damage underneath is significant.
Reporting the Bite
Most areas require dog bites to be reported, especially when the skin is broken. Your doctor or the emergency room will often file a report automatically. If you handle it yourself, contact your local animal control or health department. This isn’t just a legal formality. Reporting triggers the 10-day rabies observation for the dog and creates a record that helps track dangerous animals in the community.
If the bite came from a stray, a wild animal, or a bat, report it to your local health department even if the wound seems minor. Bites from wildlife like raccoons, skunks, and foxes carry a much higher rabies risk than domestic dog bites, and the approach to treatment is more aggressive.