If your dog suddenly develops a raw, weeping patch of skin that seems to appear overnight, you are likely dealing with a hot spot. Hot spots in dogs are one of the most common skin complaints UK vets see, and they can become serious very quickly if left untreated. At dogfoodsuk.com, we believe that understanding these painful skin infections is the first step to helping your dog recover and preventing them from coming back.
In this guide, we will explain exactly what hot spots are, what causes them, how to treat them at home, and when you need to see your vet straight away. We will also look at the role diet and supplements can play in supporting your dog’s skin health from the inside out.
What Are Hot Spots in Dogs?
Hot spots, also known as acute moist dermatitis or pyotraumatic dermatitis, are localised areas of inflamed and infected skin. They develop rapidly, often within hours, and can grow from a small red spot to a large, painful sore in a matter of a day or two. This speed of development is what makes them so alarming for dog owners and so important to treat promptly.
The medical term “pyotraumatic dermatitis” gives a helpful clue about what is actually happening. “Pyo” refers to pus, “traumatic” refers to the self-inflicted damage from scratching and licking, and “dermatitis” simply means inflammation of the skin. In practice, this means hot spots start as a small irritation that your dog then makes much worse by constantly scratching, biting, or licking the affected area.
Hot spots are most commonly found on the head, neck, hips, and chest, though they can appear anywhere on your dog’s body. The affected skin typically becomes red, moist, and oozing, and the hair in the area often falls out or gets matted with discharge. According to the PDSA, hot spots are particularly common during warmer months when dogs spend more time outdoors, but they can occur at any time of year in the UK.
The condition is painful and distressing for your dog. The constant urge to scratch or lick the area can prevent healing and cause the infection to spread further into surrounding tissue. This is exactly why prompt action is so important when you first notice a hot spot developing on your dog.
What Causes Hot Spots in Dogs?
Hot spots rarely appear for no reason. There is almost always an underlying trigger that starts the cycle of irritation, scratching, and infection. Understanding these triggers is essential for preventing future episodes and keeping your dog comfortable.
Allergies
Allergies are one of the most common causes of hot spots in dogs across the UK. These can include food allergies, environmental allergies such as grass pollen, and flea allergy dermatitis. When a dog is allergic to something, their skin becomes itchy and inflamed. The constant scratching breaks the skin barrier, allowing bacteria to enter and multiply, which then leads to a hot spot developing.
Food allergies are particularly tricky because they can develop at any age, even to foods your dog has eaten for years without any problems. Common culprits include chicken, beef, dairy, wheat, and soy. If your dog develops recurring hot spots that do not respond to standard treatment, a food allergy may well be worth investigating with your vet.
Moisture and Dampness
Dogs with thick coats or dogs that swim frequently are especially prone to hot spots caused by moisture. When water gets trapped close to the skin, it creates a warm, humid environment where bacteria can thrive and multiply rapidly. This is very common after swimming in lakes or rivers, after baths if the coat is not dried properly, or during the UK’s wet weather when dogs return from walks with damp fur.
Dogs with skin folds, such as bulldogs, pugs, and spaniels, are particularly vulnerable because moisture collects in the folds and is very difficult to dry out completely without daily attention.
Fleas and Parasites
Flea bites are incredibly irritating to dogs, and some dogs develop a severe allergic reaction to flea saliva called flea allergy dermatitis. Even a single flea bite can trigger intense itching that leads to scratching and hot spots forming. Regular flea prevention is essential for all dogs, but especially those that are already prone to skin problems.
Other parasites like mites and ticks can also cause skin irritation that leads to hot spots. Mange mites burrow into the skin, causing severe itching and hair loss, while tick bites can become infected if they are not removed properly and cleanly.
Matted Fur and Poor Grooming
When fur becomes matted, it pulls on the skin and traps moisture, debris, and bacteria against the surface. Dogs with long or thick coats that are not regularly groomed are at a much higher risk of developing hot spots. Matting prevents air from reaching the skin, creating the perfect conditions for bacterial growth and infection.
Underlying Health Conditions
Sometimes hot spots are a symptom of a deeper health issue that needs proper investigation. Conditions that weaken the immune system or affect the skin barrier can make dogs much more susceptible to hot spots and other skin infections. These include hypothyroidism, Cushing’s disease, diabetes, and certain autoimmune conditions. If your dog keeps getting hot spots despite good grooming and parasite control, it is well worth asking your vet to investigate possible underlying causes.
Signs and Symptoms of Hot Spots
Recognising the early signs of a hot spot can make a big difference in how quickly your dog recovers and how much discomfort they experience. The earlier you catch it, the easier it is to treat effectively.
The first sign is usually a small area of red, inflamed skin. Your dog may start scratching, licking, or biting at this area obsessively, often when you are not watching. Within hours, the spot can become moist and start oozing clear or yellowish fluid. The hair around the area may fall out or become matted and stuck to the weeping skin.
As the hot spot progresses, you may notice the following symptoms developing:
- Redness and swelling around the affected area that is warm to the touch
- Moist, oozing skin that may have a foul smell as bacteria multiply
- Hair loss around the sore, either from the infection or from your dog pulling the fur out
- Crusting or scabbing as the area attempts to heal itself
- Pain and sensitivity when the area is touched or when your dog moves
- Behavioural changes such as restlessness, loss of appetite, irritability, or aggression when touched near the sore
In severe cases, hot spots can spread rapidly across the skin surface. The infection can penetrate deeper into the tissue layers, causing significant pain and potentially leading to more serious complications that require intensive veterinary treatment. This is why the PetMD veterinary team strongly emphasises the importance of early treatment. If you notice a hot spot that is larger than a two-pound coin, appears to be spreading quickly, or is located near your dog’s eyes or ears, you should contact your vet without delay.
Which Dogs Are Most Prone to Hot Spots?
While any dog can develop a hot spot at any time, certain breeds and types of dogs are significantly more susceptible due to their coat type, skin structure, or genetic predisposition to allergies.
Thick-coated breeds are at the highest risk. Golden retrievers, Labrador retrievers, German shepherds, collies, and huskies all have dense double coats that trap heat and moisture against the skin. In the UK’s often damp climate, these breeds need extra attention to keep their coats dry and well-groomed throughout the year.
Dogs with skin folds such as English bulldogs, French bulldogs, pugs, and shar-peis are also vulnerable because moisture collects in their wrinkles and skin folds, creating a breeding ground for bacteria. Regular cleaning and thorough drying of these areas is absolutely essential for prevention.
Water-loving breeds like Labrador retrievers, spaniels, and Newfoundlands that swim frequently are prone to hot spots caused by trapped moisture in their dense undercoats. Always dry your dog thoroughly after swimming, paying special attention to areas where the coat is thickest and slowest to dry naturally.
Dogs with allergies are particularly prone to hot spots regardless of their breed. If your dog has known skin allergies or sensitivities, they will need careful ongoing management to prevent flare-ups that could easily lead to hot spots forming.
How to Treat Hot Spots at Home
Small, early-stage hot spots can often be treated at home, provided you catch them quickly and act decisively. However, if the hot spot is large, deep, oozing pus, or not improving within 24 to 48 hours of home treatment, you should see your vet straight away. Here is a step-by-step guide to safe and effective home treatment.
Regular grooming and brushing helps prevent matting that can lead to hot spots developing.
Step 1: Clip the fur around the area. Use clippers, not scissors, to carefully trim the hair around the hot spot. This exposes the area to air, which helps it dry out, and makes it much easier to clean and treat effectively. Be very gentle, as the area will be painful and sensitive. If your dog is distressed or the hot spot is in a sensitive location, consider asking a professional groomer or vet nurse to help with this step.
Step 2: Clean the area gently. Use a mild antiseptic solution or saline solution to clean the hot spot thoroughly. You can make a simple saline solution at home by dissolving half a teaspoon of salt in a cup of warm boiled water. Gently dab the area with a clean cloth or cotton wool soaked in the solution. Avoid using hydrogen peroxide or rubbing alcohol, as these can damage healthy tissue and actually delay the healing process.
Step 3: Apply a vet-recommended topical treatment. Your vet may prescribe a specific cream or spray for treating hot spots. Some over-the-counter options contain chlorhexidine, which is a safe and effective antiseptic for dogs. Never apply human creams, ointments, or antiseptic products to your dog’s skin without checking with your vet first, as many ingredients commonly found in human products can be toxic to dogs.
Step 4: Prevent your dog from licking or scratching. This is perhaps the single most important step in the treatment process. An Elizabethan collar, also known as a cone or “lampshade”, is the most reliable way to stop your dog from making the hot spot worse. Some dogs tolerate a soft recovery collar better than a rigid plastic cone. You can also try a lightweight cotton t-shirt or a body suit if the hot spot is on the body rather than the head or neck area.
Step 5: Keep the area clean and dry. Check the hot spot twice daily and clean it gently with saline solution, allowing it to air dry completely each time. Avoid bandaging the area unless your vet specifically recommends it, as bandages can trap moisture against the skin and actually make the problem worse rather than better.
Can Diet Help Prevent Hot Spots?
Diet plays a much bigger role in your dog’s skin health than many owners realise. The skin is your dog’s largest organ, and it needs the right balance of nutrients to maintain a strong protective barrier against infection and irritation. A poor diet can weaken this barrier and make hot spots much more likely to develop.
The Importance of Omega-3 Fatty Acids
Omega-3 fatty acids are among the most important nutrients for maintaining healthy skin in dogs. They help reduce inflammation throughout the body, strengthen the skin barrier, and support a healthy, shiny coat. Research published by FEDIAF, the European pet food industry body, recognises omega-3 fatty acids as a key nutrient for maintaining skin and coat condition in dogs of all ages.
The most effective omega-3 fatty acids for dogs are EPA and DHA, which are found naturally in fish oils. Salmon oil for dogs is one of the best available sources, as it provides a rich and balanced combination of both EPA and DHA. Other excellent sources include sardines, mackerel, and high-quality fish-based dog foods that list fish or fish oil prominently in their ingredients.
Dogs that do not get enough omega-3 in their diet may develop dry, flaky skin, a dull and brittle coat, and an increased susceptibility to skin infections including hot spots. Adding a quality omega-3 supplement to your dog’s daily food can make a noticeable difference to their skin and coat within four to eight weeks of consistent use.
Limited Ingredient Diets for Sensitive Dogs
If your dog’s hot spots are triggered or worsened by food allergies, switching to a limited ingredient diet may help significantly. Limited ingredient diets contain fewer potential allergens, making it easier to identify and avoid the specific ingredients that cause your dog’s reactions. Our detailed guide to dog food allergies explains how elimination diet trials work and which foods are best suited to dogs with sensitivities.
Novel protein diets, which use meats your dog has not eaten before such as duck, venison, or fish, can be particularly effective for dogs with food sensitivities. Hydrolysed protein diets, where the proteins are broken down into tiny fragments that the immune system cannot recognise and react to, are considered the gold standard for food allergy management but are usually only available through your veterinary practice.
Anti-Inflammatory Foods
Certain foods have natural anti-inflammatory properties that can support skin health from within. Foods that are rich in antioxidants, such as blueberries and spinach, help protect skin cells from damage caused by free radicals. Anti-inflammatory foods for dogs include sweet potato, turmeric in small amounts, coconut oil in moderation, and green-lipped mussel, which also provides excellent support for joint health.
Supplements That May Support Skin Health
In addition to feeding a good quality diet, certain supplements may help reduce the frequency and severity of hot spots by supporting your dog’s skin barrier function and immune system response.
Salmon oil is one of the most well-researched and widely recommended supplements for canine skin health. It provides EPA and DHA omega-3 fatty acids that help reduce inflammation and support the skin’s natural moisture barrier. Our full guide to salmon oil for dogs covers correct dosage, quality criteria, and the best products currently available in the UK market.
Probiotics are another valuable supplement to consider, particularly for dogs whose skin issues may be linked to poor gut health. The gut-skin axis is well documented in veterinary medicine, meaning that a healthy and balanced gut microbiome can translate directly to healthier skin. Probiotics for dogs can help strengthen the immune system, reduce allergic responses, and support the gut lining to prevent inflammatory substances from leaking into the bloodstream. Look for products that contain well-researched strains like Lactobacillus and Bifidobacterium.
Vitamin E is an antioxidant that supports skin cell health and helps repair damaged skin tissue. Many quality commercial dog foods already include adequate levels of vitamin E, but if your dog is particularly prone to skin problems, your vet may recommend an additional supplement. Some owners find that applying vitamin E oil directly to healing skin can also be beneficial, though you should always check with your vet before applying anything topically.
Zinc is essential for skin repair and proper immune function. Some breeds, particularly huskies and malamutes, are genetically predisposed to zinc deficiency, which can cause chronic skin problems including recurring hot spots. A zinc supplement, always given at your vet’s recommended dosage, can make a significant difference for affected dogs over time.
For a more comprehensive approach to your dog’s digestive and skin health, our article on dog gut health explores the important connection between digestion and skin condition in greater detail.
When to See Your Vet About Hot Spots
While minor hot spots can often be managed at home with careful attention, there are several clear situations where professional veterinary treatment is necessary. Hot spots can progress very quickly indeed, and delaying treatment can lead to much more serious infections and complications that are harder and more expensive to treat.
See your vet immediately if:
- The hot spot is larger than a two-pound coin or appears to be spreading rapidly across the skin
- The area is oozing thick pus or has a strong, unpleasant smell, which may indicate a deep bacterial infection that needs antibiotics
- Your dog is in significant pain, yelping, whimpering, or becoming aggressive when the area is touched
- The hot spot is located near your dog’s eyes, ears, or mouth, where infection could spread to sensitive and important tissues
- Your dog has developed a fever, is unusually lethargic, or has lost their appetite
- The hot spot shows no signs of improvement after 24 to 48 hours of consistent home treatment
- Your dog experiences recurrent hot spots that keep coming back despite your best prevention efforts
Your vet may prescribe oral antibiotics to clear the bacterial infection, anti-inflammatory medication to reduce pain and swelling, or medicated shampoos for ongoing management of the skin. In severe cases, they may need to sedate your dog to properly clean and treat the area. The PDSA advises that prompt veterinary attention can prevent a minor skin irritation from escalating into a major health issue that requires extensive treatment.
If your dog suffers from recurring hot spots, your vet may recommend allergy testing to identify specific environmental or food triggers, a properly supervised food elimination trial, or blood tests to check for underlying conditions such as hypothyroidism or other hormonal imbalances.
How to Prevent Hot Spots
Prevention is always better than cure when it comes to hot spots in dogs. While you may not be able to eliminate every possible risk factor, there are several practical and straightforward steps you can take to significantly reduce the chances of your dog developing them in the first place.
Establish a regular grooming routine. Brush your dog’s coat at least two to three times a week, or daily for breeds with long or thick coats. Regular brushing removes loose hair, prevents matting, and gives you the opportunity to check for early signs of skin problems. Pay extra attention to areas where matting commonly occurs, such as behind the ears, under the front legs, in the armpits, and around the base of the tail.
Dry your dog thoroughly after walks and swimming. After your dog gets wet, whether from rain, swimming, or a bath, take the time to dry their coat completely and carefully. Use an absorbent towel first to remove excess water, then a hairdryer on a low, cool setting if your dog tolerates the noise and sensation. Pay particular attention to the areas where the coat is thickest and where moisture naturally tends to get trapped against the skin.
Keep up with flea and parasite prevention all year round. Use a vet-recommended flea treatment consistently, not just during the summer months. In the UK, central heating in homes can keep flea populations active throughout the winter. Regularly check your dog for ticks after walks in grassy or wooded areas, and discuss an appropriate parasite prevention programme with your vet.
Manage allergies proactively. If your dog has known allergies, work closely with your vet to develop a comprehensive management plan. This might include regular antihistamine medication, prescription allergy sprays, or a carefully controlled elimination diet. Identifying and avoiding allergy triggers, whether they are certain foods, grass pollens, house dust mites, or other household substances, is key to preventing the itch-scratch cycle that so often leads to hot spots.
Check your dog’s skin regularly during grooming sessions. Make a habit of running your hands over your dog’s entire body while brushing. Feel for any lumps, bumps, areas of unusual warmth, or spots where the skin feels different from the surrounding area. Early detection means earlier treatment and a faster, more comfortable recovery for your dog.
Keep your home and your dog’s bedding clean. Wash your dog’s bedding weekly in hot water to remove accumulated allergens, bacteria, and parasites. Vacuum your home regularly to reduce dust mites and other environmental allergens. Consider using a pet-safe laundry detergent that does not contain strong fragrances or chemicals that could irritate your dog’s sensitive skin.
Hot Spots vs Other Skin Conditions
Hot spots share some symptoms with other common dog skin conditions, and it can sometimes be difficult for owners to tell them apart. Here is how hot spots compare to some similar-looking conditions you might encounter.
Hot spots vs belly rash. Hot spots are localised, typically circular or oval patches that appear suddenly and are intensely itchy and painful for your dog. A rash on your dog’s belly, on the other hand, may cover a broader area of skin, develop more gradually over days or weeks, and may not be as sharply defined. Rashes on the belly are commonly caused by contact allergies to grass or cleaning products, heat rash, or irritation from lying on certain surfaces for long periods.
Hot spots vs ringworm. Ringworm is a fungal infection, not an actual worm, that causes circular patches of hair loss with a red, crusty edge and often a clearer centre. Unlike hot spots, ringworm patches are usually not particularly itchy or painful for the dog. Ringworm is also contagious to humans and other pets in the household, so it is very important to get an accurate diagnosis from your vet if you suspect ringworm rather than a hot spot.
Hot spots vs yeast infections. Yeast infections develop much more slowly than hot spots and typically produce a distinctive musty or cheesy smell that is hard to miss. They often affect the ears, between the toes, skin folds, and the groin area. While hot spots are bacterial in nature, yeast infections in dogs are caused by an overgrowth of the naturally occurring yeast organism Malassezia. Yeast infections tend to cause chronically itchy skin rather than acutely painful sores, and the affected skin often becomes thickened, darkened, and greasy over time.
Hot spots vs mange. Mange is caused by microscopic mites and results in intense itching, widespread hair loss, and crusty skin lesions across multiple areas of the body. Unlike hot spots, mange is not confined to a single patch and typically affects several areas at once. Sarcoptic mange is highly contagious to other dogs and even to humans, while demodectic mange is related to the immune system and is not contagious. Both types require specific veterinary diagnosis and treatment.
If you are unsure whether your dog has a hot spot or another skin condition, it is always safest to consult your vet for an accurate diagnosis before starting any treatment at home.
Frequently Asked Questions About Hot Spots in Dogs
Can hot spots spread from one dog to another?
Hot spots themselves are not contagious, as they develop when bacteria that normally live on the skin surface multiply in a damaged area. However, the underlying causes, such as fleas or mites, can certainly spread between dogs in the same household. If one dog develops hot spots, it is a good idea to check your other dogs carefully and ensure all are up to date with effective parasite prevention treatments.
How long do hot spots take to heal?
With prompt and consistent treatment, minor hot spots typically start to improve within two to three days and heal completely within one to two weeks. Larger or deeper hot spots may take three to four weeks to fully resolve, especially if oral antibiotics are needed. Keeping your dog from licking the treated area is one of the most important factors in achieving a quick and complete recovery.
Are hot spots more common in summer?
Yes, hot spots are definitely more common during the warmer months. Heat and humidity create ideal conditions for rapid bacterial growth on the skin, and dogs spend more time outdoors where they encounter allergens, get wet from swimming, and pick up parasites. However, hot spots can and do occur at any time of year, particularly in dogs with underlying allergies, thick coats, or chronic skin conditions.
Can I use human antiseptic cream on my dog’s hot spot?
No, you should never use human antiseptic creams, ointments, or lotions on your dog’s skin without specific veterinary advice. Many products designed for humans contain ingredients that are toxic to dogs if ingested, and your dog will naturally lick the treated area. Your vet can recommend safe, dog-specific topical treatments that are appropriate for the severity of the hot spot.
Why does my dog keep getting hot spots?
Recurring hot spots almost always indicate an underlying issue that has not been properly identified or addressed. Common causes include untreated or poorly managed allergies, chronic flea problems, inadequate grooming, or an underlying health condition such as hypothyroidism. If your dog experiences repeated episodes of hot spots, it is very important to work with your vet to identify and address the root cause rather than just treating each spot as it appears.
Should I bathe my dog if they have a hot spot?
You can bathe your dog, but you should try to avoid getting the hot spot wet if at all possible. Use a gentle, hypoallergenic dog shampoo and rinse the coat very thoroughly to remove all traces of shampoo. After the bath, dry your dog completely and carefully, paying special attention to the coat around the hot spot. If the hot spot is on the body, you can cover it with a waterproof dressing during the bath to protect it from water and shampoo.
Can diet alone cure hot spots?
Diet alone is unlikely to cure an active hot spot, as the bacterial infection needs to be treated directly with appropriate cleaning and possibly medication. However, improving your dog’s diet, particularly by adding omega-3 fatty acids and addressing any undiagnosed food allergies, can significantly reduce the frequency of future hot spots and support the skin’s natural ability to heal and resist infection.
Conclusion
Hot spots are painful, distressing for your dog, and can develop frighteningly quickly. They can also become serious if not treated promptly and properly. Understanding the common causes, from allergies and excess moisture to fleas and matted fur, gives you the knowledge to act fast when you first spot the early warning signs. Small, early hot spots can often be managed at home with careful cleaning, clipping the surrounding fur, and preventing your dog from licking the area, but larger, deeper, or worsening hot spots always need proper veterinary attention.
Prevention plays an absolutely crucial role in keeping hot spots at bay over the long term. Regular grooming, thorough drying after wet walks and swimming, consistent year-round flea control, and a diet rich in omega-3 fatty acids all help to support your dog’s natural skin defences. For dogs with recurring hot spots, working closely with your vet to identify and manage underlying allergies or health conditions is essential for lasting improvement.
A healthy diet and consistent grooming routine help keep your dog’s skin in top condition and reduce the risk of hot spots.
At dogfoodsuk.com, we are committed to helping UK dog owners make informed decisions about their dog’s nutrition and overall health. If you found this guide helpful, you may also want to explore our articles on salmon oil for dogs, probiotics for gut and skin health, and anti-inflammatory foods for dogs for a more complete picture of how nutrition can support your dog’s health from the inside out.
Remember, every dog is different and what works well for one dog may not be the best approach for another. Always consult your vet before making significant changes to your dog’s diet or starting any new supplements, especially if your dog has an existing health condition or is currently taking prescribed medication.