A dog bite can range from a minor scrape to a serious wound, but every bite that breaks the skin carries a risk of infection. Somewhere between 2% and 25% of dog bites become infected, depending on the location and depth of the wound. What you do in the first few minutes and hours makes a real difference in how well you heal.
Clean the Wound Right Away
If the bite is bleeding heavily, press a clean cloth or bandage firmly against the wound until the bleeding slows. Once you can manage it, wash the bite thoroughly with soap and water. This is the single most effective thing you can do to reduce infection risk. Dog saliva carries dozens of bacterial species, and flushing them out early matters more than any ointment you apply afterward.
For minor bites that only break the surface of the skin, apply an antibiotic cream and cover the wound with a clean bandage. For anything deeper, a puncture wound, a bite on your hand or face, or a wound with torn skin, you should get medical attention the same day.
Why Dog Bites Get Infected So Easily
A dog’s mouth is home to a complex mix of bacteria. In a large study of dog bite infections, the most common bacteria found were Pasteurella species (in about 50% of wounds), followed closely by Streptococcus and Staphylococcus species (each around 46%). Anaerobic bacteria, the kind that thrive in deep puncture wounds where air can’t reach, were also frequently present.
This bacterial cocktail is what makes dog bites more infection-prone than, say, a cut from a kitchen knife. Puncture wounds are especially risky because teeth push bacteria deep into tissue, then the small entry point seals over and traps them inside. Bites on the hands are notorious for infection because the tendons, joints, and thin tissue there give bacteria easy access to structures that are hard for your immune system to defend.
Signs of Infection to Watch For
Infection from a dog bite typically shows up within about 24 hours, though it can appear sooner or take a couple of days. The signs to look for are:
- Increasing redness that spreads outward from the wound, sometimes in streaks
- Swelling and warmth around the bite
- Pus or cloudy discharge from the wound
- Fever
- Worsening pain after the first day, rather than gradual improvement
Some redness and soreness right after a bite is normal. The warning sign is when those symptoms get worse over the next day or two instead of better. If redness is spreading or you develop a fever, that’s a clear signal to get medical care quickly.
What Happens at the Doctor’s Office
A doctor will clean the wound more thoroughly than you can at home, often irrigating it with a pressurized saline solution to flush out bacteria from deep tissue. One of the key decisions is whether to close the wound with stitches or leave it open.
Bites on the face are often stitched because the area has excellent blood flow and heals well, and leaving facial wounds open creates worse scarring. But bites on the hands, feet, or other areas are frequently left open, especially if the wound is more than eight hours old or shows any sign of infection. Closing an infected wound traps bacteria inside and can make things significantly worse. Puncture wounds are also generally left open because there’s no good way to clean them completely.
For high-risk bites, doctors typically prescribe a short course of preventive antibiotics, usually three to five days. The most commonly prescribed option covers the broad mix of bacteria found in dog saliva. If you’re immunocompromised, or the bite is on your hands, feet, or face, the course may run longer.
Tetanus and Rabies
Your doctor will check whether your tetanus vaccination is current. If your last booster was more than five years ago and the wound is deep or contaminated, you’ll likely need one.
Rabies is rare in domestic dogs in the United States, but it’s almost always fatal once symptoms appear, so doctors take it seriously. The decision about whether you need rabies post-exposure treatment depends on several factors: whether the dog’s vaccination status is known, whether the dog was behaving strangely, and whether the dog can be located and observed for ten days. If there’s any doubt, the treatment involves a series of vaccine doses plus an injection of rabies antibodies. If you’ve been vaccinated against rabies before, you’ll only need two booster doses three days apart.
Bites from stray or wild animals carry higher rabies risk. If you were bitten by a dog you don’t know and can’t locate, tell your doctor immediately, as that changes the calculus significantly.
Reporting the Bite
Most states require dog bites to be reported to local animal control or the health department. This isn’t just a bureaucratic formality. Reporting triggers a rabies quarantine observation for the dog, typically ten days, which protects both you and the community. If a healthcare provider treats your bite, they’re generally required to file a report. But in many jurisdictions, anyone with knowledge of the bite is legally required to report it. Your local animal control office can walk you through the process.
Long-Term Complications
Most dog bites heal without lasting problems, especially with prompt cleaning and appropriate medical care. But deeper bites can cause damage that persists well beyond the initial wound.
Nerve damage is one of the more serious possibilities. A dog’s teeth can sever nerves directly, causing numbness or loss of movement in the affected area. Even without direct nerve injury, swelling around the bite can compress nearby nerves, leading to tingling, pain, or weakness. As the wound heals, scar tissue can trap or pinch nerves, creating chronic symptoms like burning sensations or muscle weakness. Some people recover full sensation and function over time. Others deal with partial numbness or pain long-term.
Scarring varies widely depending on the bite’s location and severity, and whether the wound was stitched. Bites that tear the skin tend to leave more visible scars than clean punctures. Facial bites, while they generally heal well due to strong blood flow, can cause cosmetically significant scarring that some people choose to address with later procedures.
The psychological effects are worth acknowledging too. A fear of dogs, anxiety, and symptoms of post-traumatic stress are common after serious bites, particularly in children. These reactions are normal and often improve with time, though some people benefit from professional support.