By Dial A Vet Veterinary Team
Skin problems are one of the most common reasons dogs see a vet in Australia, and our warm, humid summers, grass seeds, and year-round fleas do not help. The tricky part is that very different conditions look alike. A red, itchy, balding patch could be flea allergy, a mite infestation, ringworm that can spread to your children, or an early skin tumour. Rather than relying on photos, which can mislead when conditions overlap, this guide describes 15 common dog skin diseases in plain language: what each typically looks like, where it shows up, and what it usually means for your dog.
Key takeaways
- Itching, redness, hair loss, scabs, odour, and lumps are shared signs across many skin diseases. A vet often needs simple tests to tell them apart.
- Allergies (flea, environmental, and food) drive most itchy skin in dogs, and infections often follow.
- Some conditions, including sarcoptic mange and ringworm, can spread to people and other pets.
- Any new or changing lump should be checked, ideally with a needle sample.
- A painful, rapidly spreading wound, or skin problems with fever or lethargy, need prompt care.
15 common skin diseases in dogs
1. Flea allergy dermatitis. Intense itching and red, scabby skin over the lower back, tail base, and back of the thighs. A few flea bites can trigger it.
2. Atopic dermatitis (environmental allergy). Itchy paws, face, armpits, belly, and ears, often seasonal at first. Common in Labradors, West Highland terriers, French bulldogs, and many others.
3. Food allergy. Itching similar to atopy, often year-round, sometimes with ear infections or soft stools. Diagnosed with a strict elimination diet trial.
4. Contact dermatitis. Redness on thinly haired areas such as the belly and paws after contact with plants (wandering jew, a classic in Australian gardens) or chemicals.
5. Sarcoptic mange (scabies). Severe itching with crusting on ear edges, elbows, and belly. Contagious to other dogs and can cause itchy bumps on people.
6. Demodectic mange. Patchy hair loss, often around the eyes and face of young dogs, usually not very itchy unless infected. Not contagious to people.
7. Hot spots (acute moist dermatitis). Sudden, painful, wet, red patches that spread over hours, often on the neck or hips of thick-coated dogs in humid weather.
8. Bacterial skin infection (pyoderma). Pimples, crusts, and circular scaly rings, usually secondary to allergy or another problem.
9. Yeast infection (Malassezia). Greasy, smelly, darkened skin in skin folds, paws, and ears. Often secondary to allergies.
10. Ringworm (dermatophytosis). A fungal infection causing round patches of hair loss with scaling. Can spread to people, especially children.
11. Seborrhoea. Flaky dandruff or greasy coat with a strong odour. May be inherited or a sign of another disease.
12. Lick granuloma. A thick, hairless, raised sore, usually on the front of a lower leg, from persistent licking linked to allergy, pain, or anxiety.
13. Hormonal skin disease. Symmetrical hair loss on the body and thin skin, often without itching, seen with hypothyroidism or Cushing's disease.
14. Autoimmune skin disease. Crusts and sores on the nose, ears, and paw pads, as in pemphigus or lupus. Diagnosed by biopsy.
15. Skin tumours. Lumps of any type, from harmless fatty lumps to mast cell tumours. Many look identical from the outside. See mast cell tumours in dogs and skin tags versus skin cancer.
When to see a vet
Emergency or same day: a rapidly spreading or very painful wound, sudden facial swelling or hives, skin problems with fever, lethargy, or not eating, or a hot spot spreading quickly.
Within a few days: itching that stops your dog sleeping, open sores, a lump that is growing, changing, or bleeding, or patchy hair loss in a puppy.
Book a routine visit: mild itching that keeps returning, dandruff, odour, or a small new lump.
What you can do at home
- Keep every pet in the house on effective flea control, year-round.
- Take clear photos of the problem as it changes. This helps your vet.
- Prevent licking and scratching with a cone or a soft T-shirt.
- Avoid human creams, tea tree oil, and home remedies that may irritate the skin or be toxic when licked.
- Wash your hands after touching suspicious patches, especially circular bald spots.
How vets typically diagnose and treat
Most skin workups start with a few quick tests: skin scrapes for mites, tape or impression samples to look for bacteria and yeast, combing for fleas, and sometimes a fungal culture. Lumps are sampled with a fine needle. Biopsies are used when the diagnosis is not clear. Treatment depends on the cause and may include parasite control, medicated washes, itch relief, treatment of infection, diet trials, and long-term allergy management. Many skin diseases are managed rather than cured, so expect follow-up visits.
Prevention
- Maintain flea, tick, and mite prevention.
- Dry your dog properly after swimming, especially skin folds and ears.
- Brush regularly and check skin during grooming.
- Check paws and armpits for grass seeds after walks in spring and summer.
- Feed a complete, balanced diet and avoid frequent diet changes.
FAQ
Can dog skin diseases spread to people?
Some can, including sarcoptic mange and ringworm. Most allergy-related skin disease does not.
Why does my dog keep getting skin infections?
Recurring infections usually point to an underlying cause, most often allergy. Treating the trigger reduces the cycle.
Are my dog's itchy ears related to its skin?
Often, yes. Ears are lined with skin and are commonly affected by allergies. See dog ear infection symptoms.
Talk with a vet
Photos of skin problems can be shared with a vet at Dial A Vet to help you decide how quickly to be seen and what tests might be useful. A painful, rapidly spreading wound or a lethargic dog needs to be seen in person promptly.
References
- Merck Veterinary Manual. Dermatologic disorders of dogs.
- World Small Animal Veterinary Association (WSAVA). Dermatology and allergy resources.
- American College of Veterinary Dermatology. Pet owner information on allergies and skin disease.
- CDC. Ringworm and pets.
Disclaimer: Educational only. This page does not replace an examination by a veterinarian. Skin conditions look alike and usually need testing for a diagnosis.
