Dog Hot Spots Explained: Causes, Treatment & Prevention Guide
Last Updated: July 2026
Reading Time: 12 Minutes
Article Summary
Hot spots are one of the most common skin problems in dogs and can develop surprisingly fast. These red, moist, and painful skin lesions often result from excessive scratching, licking, or chewing caused by allergies, insect bites, skin infections, or underlying irritation. This guide explains what dog hot spots are, why they happen, how to recognize the early signs, and what pet owners can do to help prevent future flare-ups while knowing when veterinary care is necessary.
Quick Answer
What are hot spots on dogs?
Dog hot spots, also called acute moist dermatitis, are inflamed, infected areas of skin that develop when dogs repeatedly scratch, lick, or chew the same location. Hot spots are usually red, painful, warm, and moist, and they can spread rapidly if left untreated. Identifying the underlying cause—such as allergies, fleas, moisture, or skin irritation—is essential for successful treatment and prevention.
Key Takeaways
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Dog hot spots can appear within hours after excessive scratching or licking.
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Allergies are one of the most common underlying causes.
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Moist, inflamed skin creates an ideal environment for bacterial overgrowth.
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Early intervention may help prevent larger skin infections.
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Dogs with recurring hot spots should be evaluated by a veterinarian.
Table of Contents
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What Are Dog Hot Spots?
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Common Symptoms of Hot Spots
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What Causes Dog Hot Spots?
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How Are Hot Spots Treated?
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How to Prevent Future Hot Spots
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Frequently Asked Questions
Introduction
Did your dog seem perfectly fine yesterday, only to wake up today with a large red, wet patch on their skin?
That rapidly developing sore could be a hot spot.
Hot spots are among the most common skin conditions veterinarians see, especially during warm and humid months. They often appear suddenly and can become significantly worse within a day if a dog continues scratching, licking, or chewing the affected area.
Many pet owners are surprised by how quickly a small area of irritation turns into a painful skin lesion.
Common signs include:
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Bright red skin
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Constant licking or chewing
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Hair loss around the area
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Moist or oozing skin
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Sensitivity when touched
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An unpleasant odor if infection develops
Although hot spots themselves are not contagious, they usually indicate that something else is irritating your dog's skin.
Finding and addressing that underlying cause is just as important as treating the sore itself.
In this guide, you'll learn what hot spots are, why they develop, how to recognize them early, and practical ways to help reduce the risk of future skin problems.
What Are Dog Hot Spots?
Dog hot spots, medically known as acute moist dermatitis, are localized areas of inflamed skin that develop after repeated scratching, licking, biting, or rubbing.
The constant trauma damages the skin's protective barrier, allowing naturally occurring bacteria on the skin to multiply rapidly.
As inflammation increases, the affected area often becomes:
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Bright red
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Warm to the touch
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Moist or oozing
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Painful
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Hairless
Without treatment, hot spots can expand quickly—sometimes doubling in size within 24 to 48 hours.
Hot spots are not a disease themselves. Instead, they are usually the result of an underlying problem that causes persistent itching or irritation.
Why Is My Dog Itching but Has No Fleas? 9 Common Causes & When to See a Vet
Hot spots often begin with persistent itching. Learn about the many possible reasons your dog may be scratching—including allergies, dry skin, parasites, and skin infections.
👉 Read: Why Is My Dog Itching but Has No Fleas? 9 Common Causes & When to See a Vet
Common Symptoms of Dog Hot Spots
The appearance of a hot spot can change rapidly, but most cases begin with mild skin irritation before progressing into a painful lesion.
Recognizing the symptoms early may help reduce the severity of the condition.
Red, Inflamed Skin
The earliest sign is often a small patch of bright red skin.
As inflammation worsens, the area becomes increasingly irritated and sensitive.
Constant Licking or Chewing
Dogs instinctively lick painful or itchy areas.
Unfortunately, this repeated licking introduces more moisture and bacteria, making the hot spot larger over time.
Hair Loss Around the Lesion
Hair often falls out or becomes matted around the affected skin.
This exposes the inflamed tissue and allows the lesion to spread more easily.
Moist or Oozing Skin
Unlike dry skin conditions, hot spots are typically wet.
You may notice:
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Clear fluid
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Yellow discharge
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Sticky fur
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Crusting as the lesion begins to dry
Pain and Sensitivity
Many dogs react when the area is touched.
Some may:
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Flinch
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Whine
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Pull away
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Become reluctant to be groomed
Pain often increases as inflammation progresses.
Dog Seasonal Allergies Guide: Signs, Causes & Natural Relief
Seasonal allergies are one of the leading triggers of repeated scratching that can eventually lead to hot spots. Learn how environmental allergens affect your dog's skin and how early management may help reduce flare-ups.
👉 Read: Dog Seasonal Allergies Guide: Signs, Causes & Natural Relief
What Causes Dog Hot Spots?
Hot spots don't develop without a reason.
They are usually the result of another condition that causes your dog to scratch, lick, or bite the same area repeatedly.
Finding the underlying trigger is one of the most important steps in preventing future hot spots.
1. Seasonal & Environmental Allergies
One of the most common causes of hot spots is environmental allergies.
Dogs allergic to pollen, grass, weeds, mold spores, or dust mites often experience persistent itching.
Continuous scratching damages the skin barrier, creating the perfect environment for bacteria to multiply.
Common allergy signs include:
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Itchy paws
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Ear irritation
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Belly itching
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Face rubbing
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Red skin
2. Fleas and Flea Allergy Dermatitis
Even a single flea bite can trigger intense itching in sensitive dogs.
Dogs with flea allergy dermatitis may scratch aggressively around:
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Tail base
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Lower back
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Hind legs
Excessive scratching often develops into hot spots within a short period.
Regular flea prevention is one of the most effective ways to reduce this risk.
3. Moisture Trapped in the Coat
Hot spots commonly occur after:
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Swimming
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Bathing
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Playing in the rain
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High humidity
Dogs with thick or double coats retain moisture close to the skin.
Warm, damp skin encourages bacterial overgrowth, especially if the coat isn't dried thoroughly.
Breeds commonly affected include:
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Golden Retrievers
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Labrador Retrievers
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German Shepherds
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Saint Bernards
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Newfoundlands
4. Ear Infections
Dogs suffering from painful ear infections often scratch intensely around the ears and neck.
This repeated trauma may cause hot spots to develop behind the ears or along the side of the face.
If your dog experiences recurring ear infections, addressing the underlying problem is essential.
5. Parasites
In addition to fleas, other parasites may trigger severe skin irritation.
These include:
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Mites
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Ticks
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Lice
Parasitic skin diseases often cause persistent scratching that damages the skin barrier and increases the risk of secondary bacterial infection.
6. Dry Skin and Poor Skin Barrier Health
Dogs with dry or damaged skin are more likely to develop irritation after minor scratching.
Once the skin barrier becomes compromised:
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Moisture escapes more easily.
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Allergens penetrate the skin more easily.
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Bacteria multiply faster.
Maintaining healthy skin barrier function is an important part of long-term skin wellness.
🌐 Trusted Veterinary Resources
For more information about canine skin disease and hot spots, these veterinarian-reviewed resources provide additional guidance:
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American Kennel Club (AKC) — Hot Spots on Dogs
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VCA Animal hospital — Acute Moist Dermatitis
How Are Dog Hot Spots Treated?
Treatment depends on how severe the hot spot has become.
Mild cases may improve with early veterinary-guided care, while larger or infected lesions often require medical treatment.
The most important goal is to stop the cycle of:
Itching → Scratching → Skin Damage → Infection
Clip the Hair Around the Area
Veterinarians often trim the fur surrounding the lesion.
Removing excess hair helps:
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Improve airflow
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Keep the area dry
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Allow medication to reach the skin
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Prevent bacteria from becoming trapped beneath the coat
Because hot spots can be painful, this procedure should be performed carefully.
Clean the Lesion
The affected area is typically cleaned using a veterinarian-recommended antiseptic solution.
Cleaning helps remove:
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Surface bacteria
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Dirt
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Excess discharge
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Dead skin debris
Avoid using alcohol or hydrogen peroxide unless specifically recommended by your veterinarian, as these products may further irritate damaged skin.
Prevent Licking and Scratching
Even the best treatment won't work if your dog continues to traumatize the area.
Your veterinarian may recommend:
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An Elizabethan collar (cone)
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A protective recovery suit
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Keeping nails trimmed
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Reducing exposure to allergy triggers
Stopping self-trauma allows the skin to begin healing.
Treat the Underlying Cause
Treating the visible sore alone is not enough.
Depending on the diagnosis, your veterinarian may recommend management for:
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Environmental allergies
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Flea infestations
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Ear infections
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Parasites
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Yeast or bacterial skin infections
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Chronic skin disease
Without addressing the root cause, hot spots are likely to return.
🛍 Product Recommendation
Daily Skin Barrier Support Starts from Within
Healthy skin begins long before irritation appears.
VUN Skin & Allergy Soft Chews are formulated to help support normal skin barrier function, maintain healthy skin and coat, and provide everyday nutritional support for dogs prone to seasonal skin irritation.
👉 Explore VUN Skin & Allergy Soft Chews
🔗 Related Reading
Dog Itching Remedies: How to Relieve Itchy Skin and Allergies in Dogs
Hot spots often begin with persistent itching. Discover veterinarian-informed strategies to help soothe irritated skin, reduce scratching, and support healthier skin before small problems become larger ones.
👉 Read: Dog Itching Remedies: How to Relieve Itchy Skin and Allergies in Dogs
How to Prevent Dog Hot Spots
While not every hot spot can be prevented, consistent skin care and early management of itching can greatly reduce your dog's risk.
The goal is to protect your dog's skin barrier before irritation turns into infection.
Keep Your Dog's Coat Clean and Dry
Moisture trapped against the skin creates an ideal environment for bacteria.
After:
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Swimming
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Bathing
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Walking in the rain
Always dry your dog's coat thoroughly, paying special attention to thick fur around the neck, ears, chest, and hindquarters.
Dogs with long or double coats may benefit from regular grooming to improve airflow to the skin.
Stay Ahead of Allergies
Environmental allergies are one of the leading causes of recurrent hot spots.
Managing allergies early may help reduce:
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Persistent scratching
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Paw licking
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Skin inflammation
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Self-trauma
Simple habits like wiping your dog's paws after walks and limiting exposure to heavy pollen can help during allergy season.
Maintain Regular Flea Prevention
Even indoor dogs can be exposed to fleas.
A consistent veterinarian-recommended flea prevention program helps reduce flea bites and flea allergy dermatitis, two common triggers of hot spots.
Support Healthy Skin Through Nutrition
Healthy skin starts from within.
Nutrients that support normal skin barrier function include:
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Omega-3 fatty acids
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Omega-6 fatty acids
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Zinc
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Vitamin E
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Biotin
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High-quality protein
A balanced diet helps maintain healthy skin, supports coat condition, and may reduce the impact of everyday environmental stressors.
Check Your Dog's Skin Regularly
Spend a few minutes each week examining your dog's skin, especially if they are prone to allergies.
Look for:
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Small red patches
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Hair loss
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Excessive licking
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Moist areas
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Scabs
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Changes in skin odor
Finding irritation early often allows you to seek veterinary advice before a small hot spot becomes a larger skin infection.
Conclusion
Dog hot spots may appear suddenly, but they rarely happen without an underlying cause.
Whether triggered by seasonal allergies, flea allergy dermatitis, trapped moisture, parasites, or repeated scratching, hot spots are a sign that your dog's skin barrier has been compromised.
The best long-term approach is not only treating the visible sore but also identifying and managing the reason your dog is itching in the first place.
With regular skin checks, proper grooming, balanced nutrition, and timely veterinary care, many dogs can avoid recurring hot spots and enjoy healthier skin throughout the year.
Veterinary Insight
Hot spots (acute moist dermatitis) are one of the most rapidly developing skin conditions seen in dogs. Early recognition, reducing self-trauma, and addressing the underlying cause—such as allergies, parasites, or skin infections—are essential for successful management. Supporting a healthy skin barrier through routine grooming, balanced nutrition, and preventive care may help reduce future flare-ups, but persistent or worsening lesions should always be evaluated by a veterinarian.
This information is intended for educational purposes and should not replace professional veterinary advice.
📍 Explore More Skin & Allergy Resources
Want to learn more about itchy skin, seasonal allergies, dry flaky skin, skin infections, and everyday skin barrier care?
Visit our Skin & Allergy Health Hub for veterinarian-informed guides that help you better understand common canine skin conditions and support your dog's long-term skin health.
👉 Explore the Skin & Allergy Health Hub
Frequently Asked Questions ( FAQ )
1. What are hot spots on dogs?
Hot spots are inflamed, moist areas of skin caused by excessive scratching, licking, or chewing. Veterinarians refer to them as acute moist dermatitis, and they often develop very quickly.
2. What causes hot spots in dogs?
Common causes include environmental allergies, flea allergy dermatitis, trapped moisture, parasites, ear infections, and repeated skin irritation that damages the skin barrier.
3. Can dog hot spots heal on their own?
Very small hot spots may improve if the underlying irritation stops immediately, but many continue to worsen because dogs keep licking and scratching the area. Veterinary evaluation is recommended if the lesion grows, oozes, or appears painful.
4. Are hot spots contagious?
No. Hot spots themselves are not contagious to other pets or people. However, some underlying causes, such as certain parasites or skin infections, may require veterinary diagnosis and treatment.
5. Should I let my dog lick a hot spot?
No. Continued licking introduces more moisture and bacteria, delays healing, and often makes the lesion significantly larger.
6. Which dogs are more likely to develop hot spots?
Dogs with thick coats, seasonal allergies, flea allergies, or frequent swimming habits are generally at higher risk. Breeds such as Golden Retrievers, Labrador Retrievers, German Shepherds, and Saint Bernards are commonly affected.
7. How can I help prevent hot spots?
Regular grooming, drying the coat thoroughly after swimming or bathing, maintaining flea prevention, supporting healthy skin through balanced nutrition, and managing allergies early are among the best preventive strategies.
8. When should I see a veterinarian?
Seek veterinary care if the hot spot spreads rapidly, becomes painful, produces discharge or odor, your dog seems uncomfortable, or the problem keeps coming back despite home care.
References
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American Kennel Club (AKC) — Hot Spots on Dogs
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Merck Veterinary Manual — Acute Moist Dermatitis
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American Animal Hospital Association (AAHA) — Canine Preventive Care Guidelines
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World Small Animal Veterinary Association (WSAVA) — Global Nutrition Guidelines
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PetMD — Hot Spots in Dogs