How to Treat a Bacterial Skin Infection on a Dog at Home

Based on peer reviewed veterinary research · For educational purposes only · Updated October 2026 · 8 min read

What Is a Bacterial Skin Infection in Dogs?

A bacterial skin infection in dogs, called pyoderma (literally, pus in the skin), is an overgrowth of bacteria on or within the skin that causes redness, pustules, crusts, and itch. In dogs it is most often superficial, affecting the outer skin layers and hair follicles, and the bacterium involved is usually Staphylococcus pseudintermedius, a normal skin resident that overgrows when the skin is damaged or inflamed (Hillier et al., 2014).

Because the bacteria are normally present, an infection is almost always a secondary problem. Something has disturbed the skin first, most commonly allergic skin disease, fleas, or an endocrine condition, and the bacteria then take advantage (Miller et al., 2013). This is why treating the surface infection alone often leads to repeated flare-ups.

What Does a Bacterial Skin Infection Look Like on a Dog?

Superficial infections usually show pimple-like pustules, round crusted patches, red rings with a scaly edge, and patchy hair loss, often on the belly, groin, armpits, and chest where the skin is thin. Short-coated dogs can show small crusts that look like scattered scabs.

What Causes Bacterial Skin Infections in Dogs?

The most common triggers are allergies (environmental, food, or flea related), parasites, endocrine disease such as hypothyroidism, and skin trauma or moisture. Allergic dogs scratch and break the skin barrier, which allows Staphylococcus to multiply rapidly (Hillier et al., 2014).

Hot spots, formally acute moist dermatitis, are a related problem in which self-trauma and trapped moisture create a sudden, painful, weeping patch (Holm et al., 2004). Anything that keeps skin damp, such as dense coats, skin folds, or a bath that is not dried well, raises the risk. Our guide to antimicrobial resistance in dog skin bacteria explains why identifying and correcting the trigger matters so much.

How Do Veterinarians Diagnose a Bacterial Skin Infection?

Diagnosis starts with the history and a skin exam, followed by cytology, where a sample from the lesion is stained and examined under a microscope for bacteria and inflammatory cells. Cytology is quick and is considered the key test for confirming a superficial infection (Hillier et al., 2014).

Culture and sensitivity testing is usually reserved for infections that recur, do not respond to treatment, or involve rod-shaped bacteria on cytology. Guidelines also stress looking for the underlying cause, because without addressing it the infection is likely to return.

What Does Topical Treatment Do for a Superficial Infection?

Topical antiseptics reduce the bacterial load directly on the skin, and chlorhexidine is one of the best studied options in veterinary dermatology (Mueller et al., 2012). It works by disrupting bacterial cell membranes, and it binds to the outer skin layer, so it keeps working between applications. Hillier et al. (2014) recommend topical therapy alone for localized or mild superficial infections, partly because it avoids contributing to antibiotic resistance.

For small, localized problems such as a scab, a hot spot, or a few pustules, the Chlorhexidine Spray places chlorhexidine directly on the area without a full bath. For widespread infections, the Chlorhexidine Shampoo follows the bath approach used in guidelines. Both are FDA-registered OTC veterinary drugs listed on DailyMed rather than cosmetics. For comparisons of wipes and baths, see medicated wipes vs medicated baths for dogs. Always follow the label directions.

How to Treat a Bacterial Skin Infection on a Dog at Home

Home care suits small, mild, localized problems in an otherwise healthy dog. Spreading, painful, deep, or recurring lesions need veterinary care, as do any bite wounds. If your dog is on veterinary medication, ask your veterinarian before adding anything.

1. Look closely at the skin and note the size and location of the lesions, taking a photo so you can track changes.
2. Clip the hair around the lesion so the area can air out and the product can reach the skin.
3. Gently clean away loose debris and dried discharge, then pat the skin completely dry.
4. Apply a chlorhexidine product made for dogs exactly as the label directs, keeping it away from the eyes, ear canals, and mouth. For a bath, leave the shampoo on for about 10 minutes before rinsing (Mueller et al., 2012).
5. Prevent licking and scratching until the area has dried, using a recovery cone if needed.
6. Keep the skin dry and repeat as directed on the label, and call your veterinarian if the area is spreading, painful, or not improving within a few days.

With consistent use, mild superficial lesions typically begin to improve within days to a couple of weeks, but a lesion that is not improving needs to be examined. Guidelines generally advise continuing treatment until the skin has fully healed (Hillier et al., 2014).

Prevention and Long-Term Management

Preventing recurrence means controlling the underlying cause. That usually includes year-round flea prevention, a veterinary plan for allergies, and thorough drying after baths or swimming. Dogs with skin folds benefit from routine cleaning so moisture does not build up.

Keep a simple record of flare-ups, since patterns such as seasonal timing point toward allergy. Consistency matters too, and our tips on staying consistent with dog skin medication can help. If infections keep coming back, ask your veterinarian about testing for allergy or endocrine disease.

Frequently Asked Questions

Can a dog's bacterial skin infection go away on its own?

Very mild irritation sometimes settles, but true pyoderma usually keeps spreading or returns because the underlying cause remains. Infections that are spreading, painful, or lasting more than a few days should be examined by a veterinarian.

What is the best way to treat a bacterial skin infection on a dog at home?

For small, mild lesions, clip the hair, clean and dry the area, and apply a chlorhexidine product made for dogs as the label directs. Guidelines support topical antiseptics alone for localized superficial infections (Hillier et al., 2014).

How can I tell if my dog's skin infection is bacterial or yeast?

Bacterial infections tend to cause pustules, crusts, and red rings, while yeast usually causes greasy, musty-smelling, darkened skin. Cytology at the veterinary clinic is the reliable way to tell them apart, and some dogs have both.

Why does my dog keep getting bacterial skin infections?

Recurrent infections are almost always secondary to something else, most commonly allergies, parasites, or an endocrine disease. Treating only the surface infection without addressing the cause leads to repeated flare-ups.

Sources

1. Hillier A, Lloyd DH, Weese JS, et al. Guidelines for the diagnosis and antimicrobial therapy of canine superficial bacterial folliculitis. Veterinary Dermatology. 2014;25(3):163-e43.
2. Mueller RS, Bergvall K, Bensignor E, Bond R. A review of topical therapy for skin infections with bacteria and yeast. Veterinary Dermatology. 2012;23(4):330-e62.
3. Holm BR, Rest JR, Seewald W. A prospective study of the clinical findings, treatment and histopathology of 44 cases of pyotraumatic dermatitis. Veterinary Dermatology. 2004;15(6):369-376.
4. Miller WH, Griffin CE, Campbell KL. Muller and Kirk's Small Animal Dermatology. 7th ed. Elsevier; 2013.

Related Reading

• Antimicrobial Resistance in Dog Skin Bacteria: A Growing Concern for Pet Owners
• Medicated Wipes vs Medicated Baths for Dogs: When to Use Each
• Chronic Non-Healing Wounds in Dogs: Why Some Injuries Refuse to Close

E. Maddens

Founder of Vetified. Develops topical antifungal and antimicrobial formulations for companion animals. Vetified products are listed on DailyMed and manufactured through FDA-registered facilities in the United States.

Research basis: All Vetified content references peer reviewed research published in journals including Veterinary Dermatology, JAVMA, and Journal of Small Animal Practice.