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Body system: Ears, skin and allergies. One of the core guides in our dog health conditions library. If your dog has worrying signs right now, start with our symptom triage guides.
Pyoderma literally means pus in the skin, and it is the veterinary name for bacterial skin infection, one of the most common diagnoses in dog practice. The bacteria, usually Staphylococcus pseudintermedius, a normal resident of dog skin, are opportunists: they multiply when the skin surface is disturbed, inflamed or damaged, and produce the pimple like pustules, red bumps, crusts and expanding scaly rings that owners notice. Surface and superficial pyoderma affect the outer layers and are by far the most common forms; deep pyoderma burrows into and under the follicles, producing painful sores, swelling and draining tracts, and is a more serious disease.
Like yeast dermatitis, pyoderma is almost never the whole story. Something opened the door: allergy most often, but also parasites, seborrhea, hormonal disease, skin folds, moisture, or a scratch that never settled. A dog treated with antibiotics alone, repeatedly, for recurring pyoderma, is a dog whose underlying condition is still at work, and each unnecessary antibiotic course also trains the bacteria toward resistance. Modern management therefore pairs the right infection treatment with a determined search for the door.
The bacteria are normal skin flora; the causes are the conditions that let them overgrow. Allergic skin disease leads the list, followed by demodectic mange, flea infestation, seborrhea, low thyroid and Cushing disease, skin fold anatomy in wrinkled breeds, persistent moisture, and immune suppression. Puppy pyoderma, or impetigo, is a mild superficial form seen on the sparsely haired belly of young puppies and usually reflects minor hygiene and immune immaturity rather than serious disease. Identifying which driver applies is the investigative heart of every recurrent case.
Breeds and dogs at higher risk: Any dog can develop pyoderma. Wrinkled and folded breeds such as Bulldogs, Shar Peis and Pugs get fold pyoderma readily; allergy prone breeds get it as part of their skin disease; and German Shepherds are known for a particularly stubborn deep form.
Your vet examines the lesions and usually samples them in the room: a slide pressed to a pustule or crust, stained and checked under the microscope, shows the bacteria (and any yeast keeping them company) and confirms the diagnosis the same visit. For infections that recur, fail to respond, or look deep, a bacterial culture and sensitivity test identifies the exact organism and which antibiotics still work against it, a step that matters more every year as resistant staph spreads. Blood work and skin scrapings look for the underlying drivers, hormones, mites and allergy, in parallel rather than after the third relapse.
Many superficial cases are now treated from the outside in: antiseptic and antifungal combination shampoos, mousses, sprays and wipes used on a proper schedule clear a large share of mild to moderate pyoderma without any oral antibiotic at all, which is better for the dog and for antibiotic stewardship. Where oral antibiotics are needed, for widespread or deep infection, the course is measured in weeks, typically at least three, and continued past the point where the skin looks normal, with the drug choice guided by culture in stubborn cases. Deep pyoderma needs longer courses, sometimes two to three months, plus pain relief and management of scarring. And layered under all of it, the underlying allergy, parasite or hormone problem is treated, because that treatment is the actual cure for recurrence.
Owners deliver most pyoderma care at home, so technique matters: bathing with the prescribed product at the prescribed frequency, full contact time before rinsing, and topical treatments applied to clean, dry skin. Keep folds clean and dry, keep parasite prevention current, and follow the allergy plan even in the good months. Track episodes in a notebook with dates, body sites and seasons; three dated episodes a year converts the conversation at the vet from another antibiotic to a full driver workup, and that conversion is the goal. If lesions are not clearly improving within two weeks of a new plan, report back rather than doubling down at home.
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The usual canine staph is a normal resident adapted to dogs and is not considered meaningfully contagious in a normal household. Basic hygiene around open sores is sensible, and immune suppressed people should mention dog skin infections to their doctor.
Because many superficial infections clear with topical antiseptic therapy alone, and sparing oral antibiotics preserves their power for when they are truly needed. If the infection is deep or widespread, antibiotics are used as well.
Superficial infections typically need at least three weeks, continued about a week beyond the skin looking clear. Deep pyoderma often needs eight to twelve weeks or more. Stopping at the first good look is the classic route to relapse.
A hot spot is one specific, sudden, surface form of bacterial infection, usually self inflicted by licking and scratching a single itchy area. Pyoderma is the broader family, including the widespread pustular and the deep forms.
Recurrence means the underlying driver is unaddressed: most often allergy, sometimes mange, seborrhea or hormonal disease. Recurrent pyoderma is an instruction to investigate, not to repeat the same prescription.
This page is general information drawn from the published guidance of the organizations listed under Sources below. It is not veterinary advice, and it does not replace your own veterinarian, who knows your dog. If your dog may have eaten something toxic, contact your veterinarian, the ASPCA Animal Poison Control Center on (888) 426-4435, or the Pet Poison Helpline on (855) 764-7661 straight away. A consultation fee may apply on the helplines. If your dog is struggling to breathe, has collapsed, is having a seizure that will not stop, or has a swollen belly with retching that brings nothing up, go to an emergency veterinarian now and do not wait to finish reading.
Last updated: November 2026. Facts on this page were checked against the sources listed above. How we work: our methodology.