If your cat just bit you, wash the wound immediately with soap and running water for at least five minutes, then get medical attention, especially if the bite broke skin. Cat bites are small but surprisingly dangerous. Their narrow, pointed teeth push bacteria deep into tissue, creating puncture wounds that seal over quickly and trap infection underneath. Roughly 50% of cat bites that puncture skin become infected, a rate much higher than dog bites.
Immediate First Aid Steps
Start by washing the bite thoroughly with soap and water. Hold the wound under running water and let it flush out as much bacteria as possible. If the bite is bleeding mildly, let it bleed for a minute or two, as this helps push bacteria out of the wound. Then gently press a clean cloth against the bite to slow the bleeding.
After washing, apply an over-the-counter antibiotic ointment and cover the wound with a clean bandage. Even if the bite looks minor on the surface, the puncture may extend into deeper tissue. This is what makes cat bites different from most scrapes or cuts you might treat at home.
Why Cat Bites Are More Dangerous Than They Look
A cat’s teeth are thin and sharp, almost like needles. When they bite, they create a narrow, deep puncture that closes up quickly at the surface. Bacteria from the cat’s mouth, most commonly a species called Pasteurella, gets deposited deep in the tissue where oxygen is limited and infection thrives. The skin heals over the top, essentially sealing bacteria inside.
Bites on the hand are particularly risky. The hand is full of tendons, joints, and thin tissue layers that give bacteria easy paths to spread. In one study from the Mayo Clinic, 30% of patients with cat bites to the hand needed to be hospitalized. Of those hospitalized patients, 67% required surgical cleaning of the wound, and some needed more than one operation. Risk factors for severe infection included bites directly over a joint or tendon, smoking, and having a weakened immune system.
Bites on the face, wrist, or near any joint also carry higher risk because of the structures underneath the skin.
Signs of Infection and How Fast They Appear
Infection from a cat bite moves quickly. About 70% of infections show symptoms within the first 24 hours, and nearly 90% appear within 48 hours. That timeline is much faster than infections from other types of wounds, which is another reason cat bites deserve prompt medical attention.
Watch for these warning signs in the hours and days after a bite:
- Increasing redness spreading outward from the wound
- Swelling that gets worse rather than better
- Intense pain at the bite site, especially if it worsens over time
- Warmth around the wound
- Pus or cloudy drainage from the puncture
- Fever or chills
- Red streaks extending from the wound toward your body
If you notice any of these, especially within the first day or two, seek medical care right away. Red streaks, fever, or rapidly spreading redness are signs the infection may be moving into deeper tissue or your bloodstream.
When You Need Medical Attention
Any cat bite that breaks the skin warrants a call to your doctor or a visit to urgent care. This is true even if the wound looks tiny. The depth of the puncture matters more than the size of the mark on your skin. Bites on the hands, fingers, wrists, or face are especially important to get checked.
You should seek care more urgently if the bite is deep or bleeding significantly, if you can see tissue beneath the skin, if the bite is near a joint, or if you have diabetes, liver disease, or any condition that weakens your immune system. People taking medications that suppress the immune system are also at higher risk for severe infection.
Your doctor will likely prescribe a prophylactic antibiotic to prevent infection from developing. The standard course runs three to seven days. Starting antibiotics early, before infection sets in, is far more effective than waiting until symptoms appear.
Tetanus and Rabies Considerations
Cat bites are classified as contaminated wounds for tetanus purposes. If it has been five or more years since your last tetanus booster, you’ll need one. If you can’t remember when your last shot was, your doctor will likely give you a booster to be safe.
Rabies is rare in domestic cats in the United States, but the stakes are too high to ignore. If your own indoor cat with current vaccinations bit you, the risk is extremely low. Even so, public health guidelines recommend observing any cat that bites a person for 10 days after the bite, regardless of vaccination status, because vaccine failures do occur in rare cases. If the cat shows any signs of illness during that 10-day window, contact your local health department immediately.
If you were bitten by a stray, feral, or unfamiliar cat, the situation is more serious. If the cat can’t be found and observed, your doctor and local health authorities will help you decide whether you need rabies post-exposure treatment. Don’t wait on this decision. Rabies is nearly always fatal once symptoms appear, but it’s completely preventable if treated before that point.
Bites From Your Own Cat
Most cat bites come from a pet at home, often during play, overstimulation, or when the cat feels scared or cornered. The infection risk is the same whether the bite comes from your beloved house cat or a stray. Your cat’s mouth carries the same bacteria regardless of how clean or well-cared-for they are.
After treating the immediate wound, it’s worth thinking about what triggered the bite. Cats often bite when they’re in pain, feeling trapped, or overstimulated during petting. If your cat has started biting more frequently or aggressively, a veterinary checkup can rule out pain or illness as the cause. Redirecting play away from your hands and toward toys, and learning your cat’s body language cues for overstimulation (tail flicking, ears flattening, skin twitching), can prevent future bites.