By Dial A Vet Veterinary Team
Pyoderma means bacterial infection of the skin. In dogs it is common because claws, teeth and constant scratching open the surface, and the coat holds moisture against the skin. Red bumps, pustules, crusts and circular "bullseye" marks (epidermal collarettes) are typical. Antibiotics and washes help, but infection usually returns unless the reason the skin failed is fixed.
Key takeaways
- Most canine pyoderma involves Staphylococcus bacteria that normally live on skin but overgrow when barriers fail.
- Surface and superficial forms are common. Deep pyoderma is more painful and serious.
- Allergy, parasites, moisture and endocrine disease are frequent underlying drivers.
- Cytology guides treatment. Guessing antibiotics from the cupboard is unsafe.
- Related: food allergies, flea-related skin disease, why tea tree oil is unsafe.
What you might see
- Red bumps or pus-filled spots
- Honey-coloured crusts
- Circular peeling rings (collarettes)
- Hair loss in patches
- Itch, odour and thickened skin in chronic cases
- In deep pyoderma: swelling, draining tracts, pain, fever, lethargy
Hot spots (acute moist dermatitis) are a related, rapidly appearing moist painful patch often triggered by fleas, anal gland pain or other itch.
Surface, superficial and deep
Surface infections involve the outermost layers and may respond well to topical therapy. Superficial pyoderma involves hair follicles and is the classic pustular form. Deep pyoderma invades deeper tissues, can be very painful, and needs prompt veterinary care. German Shepherds and some other breeds can develop especially stubborn deep forms.
Why dogs get pyoderma
Healthy skin resists bacteria. Anything that damages that barrier raises risk: fleas, atopy, food allergy, scrapes, demodicosis, moisture in folds, poor grooming of mats, and hormone diseases such as hypothyroidism or Cushing's. Moisture under wet coats after swimming without drying is a classic summer trigger in Australia.
When it is an emergency
Seek urgent care if skin is extensively raw, your dog is feverish or not eating, limbs are swollen with draining holes, facial swelling develops, or pain is severe. Puppies and immunocompromised dogs can deteriorate faster.
How vets diagnose it
Examination plus cytology (looking at cells and bacteria under a microscope) is central. Deep or recurrent cases may need culture, scrapings for mites, allergy investigation or blood tests. Ringworm and other lookalikes are considered when the pattern fits.
Treatment overview
Your vet may combine medicated washes, topical therapy and, when needed, systemic antibiotics chosen for the case. Courses for superficial pyoderma often continue beyond visual clearance. Deep infections need longer plans and sometimes imaging or surgical attention to foreign bodies. Never use leftover human antibiotics.
Stopping flea prevention gaps and controlling itch are as important as the antibiotic itself.
Dogs that scratch overnight often worsen hot spots by morning. If you wake to a wet, painful patch, keep the area from being licked and contact your vet the same day rather than waiting for a weekend miracle cream. Early cytology is quicker and kinder than delayed deep infection.
Short-coated breeds show pustules clearly. Long-coated dogs may hide crusts under mats, so part the hair along the back and thighs when itch is obvious. Grooming mats gently after pain relief advice prevents skin tears.
Home support
- Complete the full treatment course and recheck as asked.
- Prevent licking with a suit or cone while skin heals.
- Dry the coat thoroughly after baths or swimming.
- Do not apply tea tree oil, hydrogen peroxide soaks as routine care, or unknown internet pastes.
FAQ
Is pyoderma contagious to people?
Ordinary canine pyoderma is not like a human "strep throat" outbreak, but basic hygiene matters. People with weakened immunity should ask their doctor if household skin infections are present.
Can I treat it with drugstore cream?
Over-the-counter human creams are often ineffective or harmful. Get a veterinary diagnosis.
Why does it keep coming back?
An untreated allergy, flea burden or hormone disease is a common reason. Ask for a work-up if flares repeat.
Are wrinkles always infected?
Folds need regular drying and cleaning as advised. Not every wrinkle is pyoderma, but fold dermatitis is common in brachycephalic breeds.
Talk with a vet
Red, pustular or smelly skin should be checked properly. A Dial A Vet veterinarian can review photos and help you decide on urgency and preparation for culture or cytology. Book a Dial A Vet consult.
References
- Merck Veterinary Manual. Pyoderma in dogs.
- Hillier A, et al. Guidelines for the diagnosis and antimicrobial therapy of canine superficial bacterial folliculitis (Antimicrobial Guidelines Working Group of the International Society for Companion Animal Infectious Diseases).
- AVA. Antimicrobial stewardship notes for companion animal practice.
Disclaimer: Educational only. This page does not replace an examination or advice from your own veterinarian. If you are worried about your pet right now, contact your local vet or nearest emergency animal hospital.