How to Treat a Dog Scratch and Prevent Infection

Most dog scratches are minor and heal without problems as long as you clean them properly and keep an eye on them over the following days. The basic treatment is the same as for any small skin wound: wash it thoroughly, control any bleeding, protect it from dirt, and watch for early signs of infection. Where dog scratches differ from, say, a scrape on a doorframe is in what they can carry. Dogs’ paws and nails harbor bacteria picked up from the ground, from their own saliva (dogs lick their paws constantly), and from whatever they’ve been walking through, and some of those organisms can cause infections ranging from mild skin redness to serious systemic illness.

Immediate First Aid Steps

The single most important thing you can do after a dog scratch is wash the wound thoroughly and promptly. Run it under clean, lukewarm water for several minutes while gently lathering mild soap around and over the broken skin. The goal is to physically flush out bacteria, dirt, and debris before they can settle in. This isn’t a gentle rinse; you want running water moving across the wound long enough to carry away contaminants. If the scratch is shallow and barely broke the skin, a couple of minutes is usually sufficient. If it’s deeper or visibly dirty, five minutes of washing is reasonable.

After washing, pat the area dry with a clean cloth or paper towel. If there’s bleeding, apply gentle pressure with a clean gauze pad or cloth until it stops, which for most scratches takes only a few minutes. Once the wound is dry and bleeding has stopped, apply a thin layer of over-the-counter antibiotic ointment. Then cover the scratch with a clean adhesive bandage or gauze secured with medical tape. The covering does two things: it keeps new bacteria out, and it holds the ointment against the wound.

Change the bandage at least once a day, or whenever it gets wet or dirty. Each time you change it, gently clean the area again with soap and water and reapply a fresh layer of ointment. Most uncomplicated dog scratches heal within a week to ten days. Deeper scratches that cut well into the skin layers may take a bit longer and leave a faint mark.

What Makes Dog Scratches Different from Other Minor Wounds

A dog’s claws pick up a surprising amount from the environment. One study that tested dog paws in household settings found that about a quarter of sampled paws carried Clostridium difficile spores, an organism associated with intestinal infections in humans. Shoe soles were even more contaminated, but the finding illustrates that a dog’s nails are not remotely sterile; they contact the same floors, grass, and soil that collect bacteria throughout the day.¹

On top of environmental contamination, dogs regularly lick their paws. That means organisms normally found in a dog’s mouth end up on their nails. The most clinically relevant of these is Pasteurella multocida, a bacterium that thrives in the mouths of dogs and cats. When it gets introduced under the skin through a scratch or bite, it can cause a fast-moving wound infection. In one clinical series of patients who presented with infected wounds from domestic animal bites and scratches, every wound cultured positive for Pasteurella, and all patients had arrived for treatment somewhere between 12 and 72 hours after the injury, with drainage that was either bloody or overtly purulent.² One patient in that series developed a bone infection. Scratches that break the skin on the hand are especially risky because the hand’s anatomy, with its tendons and joint spaces close to the surface, gives bacteria easy paths into deeper tissues.

Another organism worth knowing about is Capnocytophaga canimorsus, a bacterium that lives harmlessly in dogs’ mouths but can occasionally cause serious illness in humans. A published case report described a healthy 66-year-old woman who developed a chronic prosthetic hip joint infection traced back to a dog scratch. Her case was unusual because Capnocytophaga infections more commonly present as sudden, overwhelming sepsis rather than a slow-burning joint infection.³ The take-home point is that even a seemingly trivial scratch from a healthy pet can introduce bacteria with real pathogenic potential, particularly when it lands near a joint replacement or other hardware.

Signs That a Scratch Is Becoming Infected

A scratch that’s healing normally will look pink and perhaps slightly tender for a day or two, then gradually improve. An infected scratch goes the other direction. Here’s what to watch for, starting roughly 12 to 48 hours after the injury:

• Increasing redness: A thin pink halo around the scratch is normal. If the redness expands or develops streaks radiating outward, that suggests spreading infection.
• Swelling and warmth: The area around the scratch feels puffy and hot to the touch, more than the initial mild inflammation you’d expect.
• Pus or cloudy drainage: Clear fluid weeping from a fresh scratch is normal. Thick, yellowish, or foul-smelling discharge is not.
• Worsening pain: A scratch should hurt less each day, not more. Throbbing or increasing tenderness is a red flag.
• Fever or chills: Systemic symptoms like fever, body aches, or swollen lymph nodes near the wound suggest the infection has moved beyond the skin.

Infection from mammalian injuries, whether bites or scratches, tends to involve a mix of aerobic and anaerobic bacteria rather than a single organism.⁴ That polymicrobial mix is one reason wound infections from animals can be stubborn; they sometimes require a broader antibiotic approach than a standard skin infection would.

When You Should See a Doctor

Not every dog scratch needs professional medical attention, but several situations call for it. If any of the infection signs described above appear, see a doctor promptly. Wound infections caught early usually respond well to oral antibiotics, but delayed treatment raises the chance of complications. Beyond infection, a few other scenarios warrant a visit:

• Deep scratches: If the wound is deep enough that you can see tissue beneath the surface skin, or if the edges gape open and won’t stay together, you may need closure with adhesive strips or stitches.
• Scratches over joints or tendons: Hands, wrists, and areas near joints are higher risk because infection can track into deeper structures quickly.
• Uncertain tetanus status: If you haven’t had a tetanus booster within the last five years and the scratch broke the skin, check with a healthcare provider. Tetanus bacteria live in soil and can enter through any wound.
• Immunocompromised individuals: If you take immunosuppressive medication, have diabetes, liver disease, or are undergoing chemotherapy, your threshold for seeking care should be lower.
• Scratches from unfamiliar dogs: If you don’t know the dog’s vaccination history, there are additional considerations around rabies that deserve a professional assessment.

A doctor treating an infected dog scratch will typically take a wound culture to identify the bacteria involved, then prescribe antibiotics accordingly. Pasteurella responds well to certain commonly used antibiotics, while other organisms may need different coverage, which is why culture matters.

Dog Scratches and Rabies Risk

Most people associate rabies with bites, not scratches, and the risk from a scratch is genuinely lower. However, it’s not zero. Rabies virus is transmitted through saliva, and because dogs lick their paws, their claws can carry saliva. The World Health Organization classifies scratches without bleeding as Category II exposure, which typically warrants vaccination but not rabies immunoglobulin. But a review of rabies deaths in one region of India over seven years found that roughly one in six fatal cases involved victims whose only exposure was a scratch or abrasion without bleeding. All of those victims failed to receive rabies immunoglobulin, and three didn’t receive any vaccination at all.⁵

If you’re scratched by your own vaccinated dog in a country where canine rabies is well controlled, rabies is almost certainly not a concern. But if you’re scratched by a stray, an unfamiliar dog, or any dog in a region where rabies circulates in the animal population, take it seriously. Rabies circulates at low prevalence in dog populations but is essentially always fatal once symptoms appear.⁶ The safest approach after a scratch from any dog of unknown rabies status is to wash the wound immediately and thoroughly, then seek medical advice about post-exposure prophylaxis. Timeliness matters enormously with rabies; once you develop symptoms it’s too late, but pre-symptomatic treatment is extremely effective.

In many areas with domestic animal control programs, the scratching dog can be quarantined and observed for ten days. If the animal remains healthy, rabies is ruled out. If you can’t locate the dog or confirm its vaccination status, your doctor will likely recommend starting the post-exposure vaccine series as a precaution.

Who Faces the Highest Risk from a Dog Scratch

For a healthy adult with a functioning immune system, most dog scratches heal without incident after basic first aid. The people who face elevated risk break down into a few groups. Anyone with a weakened immune system, whether from medication, disease, or treatment like chemotherapy, has a harder time fighting off bacteria that a healthy body would contain. Capnocytophaga infections, though rare overall, disproportionately affect people who are immunocompromised, asplenic (missing their spleen), or heavy alcohol users. When they do develop in these groups, the infections can escalate to sepsis and organ failure remarkably fast.

People with joint replacements or other implanted hardware also carry extra risk, as the case of prosthetic hip infection from a dog scratch illustrates.³ Bacteria that reach the surface of an implant can form biofilms that are extremely difficult to eradicate with antibiotics alone, sometimes requiring surgical intervention to remove and replace the hardware. If you have a prosthetic joint and get scratched near it, it’s worth mentioning to your doctor even if the wound looks minor.

Young children and older adults are at higher risk for different reasons. Children are more likely to be scratched in the first place because of how they interact with dogs, often getting close to the face and paws, and their skin can be thinner and more easily broken. Older adults may have slower wound healing, reduced immune function, and more comorbid conditions that complicate recovery. Diabetics in particular should treat any break in the skin seriously, because impaired circulation and neuropathy mean wounds on the extremities can deteriorate before they’re noticed.

Preventing Dog Scratches in the First Place

Keeping your dog’s nails trimmed is the most straightforward way to reduce scratching injuries. Short, blunt nails are far less likely to break skin than long, sharp ones. Many owners find nail trimming stressful for both themselves and their dogs, and it turns out the dogs genuinely find it unpleasant. A study of dogs during nail-trimming sessions found that their heart rate jumped significantly above resting levels during the procedure, and nearly half of the dogs either struggled excessively or escalated to aggression during the clipping of at least one nail. About a third had experienced a painful trim in the past, which likely contributed to their resistance.⁷

If your dog resists nail trims, a few strategies can help. Gradual desensitization, where you handle the paws frequently and introduce the clippers slowly over many sessions before actually trimming, reduces fear. Using a rotary nail grinder instead of clippers avoids the sharp squeeze sensation that many dogs dislike. Keeping each session short, even just one or two nails at a time, makes the experience less overwhelming. Some dogs do better at a groomer or veterinary clinic where a trained handler can keep things calm and efficient. The payoff is real: a dog with well-maintained nails is less likely to accidentally break your skin during play, jumping, or simply pawing for attention.

Beyond nail care, being mindful of interactions helps. Dogs often scratch people unintentionally during excitement: greeting you at the door, jumping onto your lap, or playing rough. Teaching a dog to keep four paws on the ground during greetings, or redirecting jumping behavior, cuts down on accidental scratches. With unfamiliar dogs, letting them approach you rather than reaching toward them reduces the chance of a defensive scratch.

Cat Scratch Disease from a Dog

Many people wonder whether a dog scratch can give you cat scratch disease. The condition is caused by a bacterium called Bartonella henselae, which is carried primarily by cats, especially kittens, and transmitted through their scratches and bites. Dogs can carry Bartonella species, but they’re not considered a major transmission route to humans for classic cat scratch disease. If you develop swollen lymph nodes near the site of a dog scratch, an infection is still possible and worth investigating, but the most likely culprits are Pasteurella, Staphylococcus, or Streptococcus rather than Bartonella.

That said, dogs can transmit other zoonotic infections through breaks in the skin. Ringworm, which despite its name is a fungal infection rather than a worm, can pass from dogs to humans through skin contact, especially if the scratch creates a portal of entry. MRSA (methicillin-resistant Staphylococcus aureus) has been documented passing between pets and their owners, though this is more commonly associated with close skin-to-skin contact or wound contamination than with a single scratch event. The general principle remains the same: any time a dog scratch breaks your skin, cleaning it thoroughly and watching for infection gives you the best chance of avoiding complications regardless of which specific organism might be involved.

What Not to Do

A few common instincts after a dog scratch are actually counterproductive. Pouring hydrogen peroxide or rubbing alcohol directly into a fresh wound is one of them. While these kill bacteria on contact, they also damage healthy tissue in and around the wound, which can slow healing and paradoxically increase infection risk by creating more dead tissue for bacteria to colonize. Plain soap and water is consistently recommended over antiseptics for initial wound cleaning. If you want to use an antiseptic, dilute povidone-iodine is gentler than peroxide or alcohol, but even that isn’t necessary for a typical scratch.

Another mistake is sealing a dog scratch wound tightly with butterfly bandages or adhesive strips when it looks deep or concerning. Closing a contaminated wound traps bacteria inside, which is why doctors are often reluctant to suture animal bite wounds immediately and instead leave them open to heal from the inside out or perform delayed closure after a course of antibiotics. If a scratch is deep enough to make you consider closing it, that’s a reason to seek medical care rather than managing it at home.

Ignoring a scratch because “it barely broke the skin” is also risky, especially for the groups discussed earlier. Even superficial scratches that don’t bleed can introduce enough bacteria to cause problems. A quick wash with soap and water takes less than two minutes and eliminates most of the risk. The investment is trivial compared to the potential downside.

Caring for a Dog Scratch on a Child

Children get scratched by dogs frequently, often during play or while learning how to interact with a pet. The wound care is the same as for adults: soap and water, antibiotic ointment, and a bandage. The challenge is usually convincing a frightened child to hold still long enough for a proper cleaning. Framing the wash as a countdown (“we’re going to hold it under the water while we count to sixty together”) can make it more manageable than an open-ended scrubbing session that feels endless to a small child.

Watch children’s scratches a bit more closely over the following days than you might your own. Young children are less likely to report early infection symptoms like increasing tenderness, and they may pick at bandages and recontaminate the wound. If the scratch is on the face, hands, or feet, where infection can spread quickly or leave noticeable scarring, consider having a pediatrician take a look even if it seems minor initially. Facial scratches in particular merit a professional evaluation because of the cosmetic considerations and the proximity to the eyes.

If a child is scratched by a dog they don’t know, all the same cautions about rabies status and tetanus apply, and it’s worth a call to the pediatrician regardless of wound severity. Children under about seven are also at higher statistical risk of dog-bite injuries in general, so the scratch may be a good prompt to review safe interactions: not approaching dogs while they eat, not putting faces close to an unfamiliar dog’s face, and learning to read basic body-language signals like a stiff posture, tucked tail, or whale eye that suggest the dog isn’t comfortable.