What Is the Risk of Infection with Dog Bites?

Dog bites send hundreds of thousands of Americans to the doctor every year, and many of those wounds become infected. A dog’s mouth carries dozens of bacteria species, and every bite drives some of that bacteria beneath the skin. Understanding the infection risk matters — it affects how serious an injury really is, how long recovery takes, and what a dog bite claim may be worth.

Why Dog Bites Get Infected So Easily

Unlike a clean cut, a dog bite is a crushing, tearing injury. Sharp teeth puncture deep into tissue while skin compresses around the wound, trapping bacteria away from the body’s natural cleansing process. Bites to the hands, feet, and joints are especially prone to infection because these areas have less blood flow and soft tissue to absorb the trauma.

Dog saliva commonly carries bacteria such as Pasteurella, Staphylococcus, Streptococcus, and Capnocytophaga canimorsus. Pasteurella is present in most infected bite wounds and can cause rapid swelling and pain within 12 to 24 hours. Capnocytophaga is rarer but far more dangerous, capable of triggering sepsis — especially in people with weakened immune systems.

Puncture Wounds vs. Lacerations

Deep puncture wounds are often riskier than larger lacerations, even though they look smaller. They bleed less, so bacteria has less chance of being flushed out, and the surface can close while infection develops underneath. Lacerations bleed more and are easier to clean, though they carry their own risk of scarring and nerve damage.

Warning Signs of an Infected Dog Bite

Infection can appear within hours or take a few days to develop. Watch for:

• Increasing redness, warmth, or swelling
• Pus or cloudy discharge
• Worsening pain instead of improvement
• Red streaks extending from the wound
• Fever, chills, or fatigue
• Swollen lymph nodes near the bite

Any of these symptoms call for prompt medical attention. Left untreated, infection can progress to cellulitis, an abscess, or sepsis — a body-wide reaction that can turn life-threatening within hours.

Who Faces the Highest Risk

Certain groups face a significantly higher risk of serious complications:

• Children, often bitten on the face, head, and neck
• Older adults, with less robust immune systems and circulation
• People with diabetes, which slows healing and immune response
• Immunocompromised individuals, including chemotherapy patients
• People without a spleen, at heightened risk from Capnocytophaga

First Aid Helps — But Doesn’t Eliminate the Risk

Washing the wound with soap and water, applying antiseptic, and bandaging it all reduce bacterial load, but first aid alone often isn’t enough. Many bites need professional wound irrigation and a course of preventive antibiotics, particularly bites to the hands, deep punctures, or bites in high-risk individuals. An X-ray may also be recommended if a bone or joint injury is suspected.

Why Infection Risk Matters for a Dog Bite Claim

In a personal injury claim, medical severity shapes value. An infection requiring hospitalization, IV antibiotics, or follow-up surgery adds real medical costs, lost income, and pain and suffering to a claim. Photographing the wound as it progresses, keeping medical records, and documenting symptoms helps establish the full extent of harm — not just the initial bite.

If you or a family member developed an infection after a dog attack in New Jersey, that history is an important part of your case and worth discussing with an experienced dog bite attorney.