Hot Spots on Dogs: What They Are, Why They Happen, and How to Treat Them at Home

Hot spots appear overnight and spread fast. Here's how to identify them, treat them at home, when to see the vet, and how to prevent them from coming back.

Alice got her first hot spot at age six, right in the middle of summer. I woke up one morning and noticed a raw, wet patch on her hip that hadn't been there the night before. By the time I got her to the vet that afternoon, it had already doubled in size. That was my introduction to acute moist dermatitis, and since then I've dealt with hot spots on both dogs enough times to have a solid at-home protocol while knowing exactly when to call the vet instead.

If your dog has a red, moist, painful patch of skin that appeared seemingly overnight, you're probably dealing with a hot spot. They look alarming, they spread fast, and your dog will not leave them alone without intervention. The good news is that most hot spots respond well to basic treatment at home, as long as you catch them early and address the underlying trigger.

What Exactly Is a Hot Spot?

A hot spot (the veterinary term is acute moist dermatitis) is a localized area of skin inflammation and bacterial infection. They typically start with some minor irritation, maybe a bug bite, a small scratch, or moisture trapped against the skin. Your dog licks or scratches at it, which breaks the skin surface and introduces bacteria. The warm, moist environment under your dog's fur becomes a breeding ground, and within hours you've got a red, oozing, painful lesion that keeps getting bigger.

Hot spots show up most commonly on the face, neck, hips, and limbs. Dogs with thick or double coats are especially prone because moisture gets trapped close to the skin. Alice, being a Chow Shepherd with that dense undercoat, has always been more susceptible during humid months. Dodo hasn't had one yet (she's only seven months old), but given her Chowdoodle coat density, I'm watching closely this summer.

Common Triggers

Understanding why hot spots develop helps you prevent them from recurring. In my experience with both dogs, these are the most frequent culprits:

Trigger How It Leads to Hot Spots Prevention
Flea bites Even one bite causes intense itching in allergic dogs Year-round flea prevention medication
Swimming or bathing Moisture trapped in thick fur Thoroughly dry your dog after water exposure
Seasonal allergies Generalized itching leads to focused scratching Allergy medication, regular bathing
Ear infections Dog scratches at ears, irritating nearby skin Regular ear cleaning, especially after swimming
Matted fur Traps moisture and debris against skin Regular brushing, especially undercoat
Boredom or stress Excessive licking creates raw spots Enrichment, exercise, addressing anxiety

Alice's hot spots have almost always been allergy-related. She gets itchy in late spring and early summer, and if I'm not staying on top of her antihistamine schedule, she'll scratch at her hips until the skin breaks. Once I figured out that pattern, prevention became much more straightforward.

How to Treat a Hot Spot at Home

If you catch a hot spot early and it's relatively small (smaller than your palm), you can usually manage it at home. Here's the protocol I follow, which my vet confirmed is appropriate for mild cases:

Step 1: Clip the fur around the area. Use electric clippers, not scissors. You need air circulation to reach the skin. Clip about an inch beyond the visible edges of the hot spot because the infection often extends further than what you can see. I know it looks dramatic when you're shaving a patch on your fluffy dog, but the fur grows back and healing requires airflow.

Step 2: Clean the wound. Use a gentle antiseptic solution. I keep Douxo S3 PYO Antiseptic Pads in our dog first aid kit specifically for this. They contain chlorhexidine, which is effective against the bacteria causing the infection without being harsh on already irritated skin. Gently wipe the area, removing any discharge or debris. For larger hot spots or dogs prone to recurring issues, bathing the area with a Curaseb Chlorhexidine 4% Shampoo can help clear bacteria from the surrounding skin and prevent the infection from spreading. I keep a bottle in our shower caddy during summer months since Alice tends to need it every few weeks during allergy season.

Step 3: Apply a veterinary-approved spray. After cleaning, I use a spray like Vetericyn Plus Antimicrobial Hot Spot Spray. It's safe if your dog licks it (which they will try to do) and helps create an environment where bacteria can't thrive. Avoid Neosporin, hydrocortisone cream, or Vaseline. Ointments and creams actually encourage licking and trap moisture, which is the opposite of what you want.

Step 4: Prevent your dog from reaching the area. This is the hardest part. A recovery cone is usually necessary for at least a few days. I know dogs hate them. Alice gives me the most betrayed look every single time. But without a cone, your dog will lick and scratch the hot spot back to square one within minutes. For hot spots on the body (hips, back, sides), a Suitical Recovery Suit is a much better alternative. It covers the torso and prevents access to the wound without the cone drama. Alice tolerates the recovery suit way better than any cone, and it keeps the treated area protected while still letting her move around normally. The inflatable donut-style cones work well for hot spots on the face or neck where a suit can't reach.

Step 5: Monitor daily. A hot spot that's responding to treatment should look less red and less moist within 24-48 hours. The edges should start drying out and the area should shrink slightly each day.

When to Skip Home Treatment and Go to the Vet

Not every hot spot is a DIY situation. Take your dog to the vet if:

When Alice's hot spot kept coming back in the same spot three summers in a row, our vet did allergy testing and we finally got her on a seasonal allergy protocol that actually prevented them. Sometimes the hot spot itself is just the symptom, and you need professional help identifying the root cause.

Prevention Strategies That Actually Work

After years of dealing with hot spots on Alice, here's what has made the biggest difference in our household:

Keep up with flea and tick prevention year-round. Even if you don't see fleas, a single bite on an allergic dog can trigger a hot spot within hours. We use Simparica Trio for both dogs, which covers fleas, ticks, heartworm, and intestinal parasites in one monthly chew.

Dry your dog thoroughly after any water exposure. This includes baths, swimming, and even walking in heavy rain. I use a high-velocity dryer on Alice's undercoat because towel drying alone doesn't reach the skin through that double coat. For Dodo, a thorough towel dry followed by a few minutes with a regular blow dryer on cool setting does the job.

Brush regularly to prevent matting. Matted fur traps moisture and creates the perfect environment for hot spots. Alice gets brushed three times a week minimum during summer, with extra attention to her hip and neck areas where she's historically prone to issues.

Address allergies proactively. If your dog gets seasonal allergies, start their antihistamine or allergy medication before peak season hits. Waiting until they're already scratching means you're playing catch-up while hot spots develop.

Provide mental stimulation. Some dogs develop hot spots from stress-licking or boredom-licking. If your dog tends to fixate on one area of their body, increasing their daily enrichment and exercise can reduce that compulsive behavior. Our enrichment toy rotation has helped with this.

Our Hot Spot First Aid Kit

I keep these items together in a labeled bag in our bathroom cabinet so I'm not scrambling when a hot spot appears at 10pm on a Sunday:

Having everything in one place means I can start treatment immediately, which makes a real difference in how quickly the hot spot resolves. The faster you intervene, the smaller the area stays and the faster it heals.

The Bottom Line

Hot spots look scary and they develop fast, but they're one of the more manageable skin conditions you'll encounter as a dog owner. The key is catching them early, keeping the area clean and dry, preventing your dog from making it worse, and knowing when the situation calls for veterinary intervention rather than home treatment.

If your dog is prone to hot spots like Alice, focus your energy on prevention. Consistent flea and tick prevention, regular grooming, allergy management, and keeping your dog's coat dry after water exposure will eliminate most of the triggers. And when a hot spot does pop up despite your best efforts, having your supplies ready means you can treat it before it becomes a bigger problem.

Have questions about hot spots or other skin issues? Follow our journey with Dodo and Alice on Instagram @thechowdodo where I share real-time updates on everything from vet visits to daily care routines.