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A dog hot spot (acute moist dermatitis) is a red, wet, painful patch of skin that the dog creates by licking, chewing or scratching one area, sometimes within hours. Fleas, allergies and ear infections are the usual triggers, and a damp, thick coat makes it worse. Today, stop the licking, keep the spot dry and call your vet.
What are hot spots on dogs?
Vets call a hot spot pyotraumatic dermatitis or acute moist dermatitis. "Traumatic" is the key word: the dog damages its own skin. Something itches or hurts, the dog licks or scratches, the skin breaks and oozes, bacteria on the surface multiply, and that makes it itch more. VCA Animal Hospitals (opens in a new tab) calls this the lick-itch-lick cycle and notes that hot spots can enlarge dramatically in a very short time.
A typical hot spot is:
- A well-defined patch of hair loss, often round
- Red, raw and moist, sometimes with yellow ooze or a crust on top
- Painful; many dogs flinch or growl when it is touched
- Often hidden under matted fur in dense coats, so it may be larger than it first looks
According to a Vet Times clinical review (opens in a new tab), they are seen most in large, dense-coated breeds such as golden retrievers, Labradors, German shepherds, collies, St Bernards and Rottweilers, and may be more common in warm, humid weather.
What causes dog hot spots?
The hot spot itself is a reaction. Finding the trigger is what prevents the next one. Common triggers named by VCA and the Vet Times review:
| Trigger | Clues |
|---|---|
| Fleas and flea allergy | Hot spots near the tail base, lower back or thighs; flea dirt in the coat |
| Environmental or food allergy | Also itchy paws, ears, belly; see seasonal allergies and food allergies |
| Ear infection | Hot spot on the cheek, below the ear or on the neck; head shaking |
| Anal gland problems | Hot spot near the rump; scooting |
| Moisture and matting | After swimming, rain or a bath in a thick-coated dog not dried to the skin |
| Pain | Hot spot over a hip, knee or wrist in an older or arthritic dog |
| Irritants and debris | Burrs, clipper irritation, plant material caught in the coat |
| Boredom or stress | Repeated licking of reachable spots like the front legs |
Location clues: neck, face, leg
- Dog hot spot on the neck or face: often linked to ear disease or a collar rubbing on damp fur. Have the ears checked.
- Dog hot spot on the leg or foot: think allergy, a reachable itch from boredom, or joint pain. See our itchy paws guide if the feet are involved.
- Hot spot on the back or rump: fleas and anal glands are the usual suspects.
Dog hot spots treatment: what a vet does
Because hot spots are painful, the most effective treatment happens at the clinic, sometimes with sedation. A typical visit includes:
- Clipping. VCA calls clipping the hair around the hot spot crucial: it shows the real size of the lesion and lets it dry.
- Cleaning with an antiseptic such as chlorhexidine.
- Medication chosen for the case: a topical anti-inflammatory or drying product, oral anti-itch or anti-inflammatory medication, and pain relief. Antibiotics are used when the vet suspects deeper infection.
- A cone or body suit so the dog cannot reach the area.
- Treating the trigger: flea control, ear treatment, anal gland expression, allergy management or pain control.
We do not list drug names or doses for hot spots; your vet will choose based on the lesion and your dog's health. For the follow-up at home, we compared which hot spot sprays, wipes and cones are worth buying, including which antiseptic can go on the raw spot and which cannot. If your dog has repeated hot spots from allergies, ask about longer-term itch control. Our Apoquel alternatives guide compares the main prescription and over-the-counter options.
Safe first aid until you see the vet
- Stop the licking. A cone, inflatable collar, or a T-shirt for body spots.
- Keep it dry. Do not cover a moist hot spot with a tight bandage, and skip baths until your vet advises.
- Gently clean only if your dog allows it, using lukewarm water or a pet antiseptic your vet has recommended, then pat dry.
- Do not use scissors to trim the hair. VCA warns it is easy to cut the skin.
- Avoid human creams and ointments (dogs lick them off), hydrogen peroxide, alcohol, tea tree oil and vinegar on raw skin.
- Do not give human pain or allergy medicine. Several are toxic to dogs.
See a vet the same day if the spot is larger than a coin and spreading, very painful, bleeding, smells bad, or if your dog is lethargic or off food.
Dog hot spot infection: when it is more than a hot spot
A classic hot spot has bacteria living on its surface, but the deeper skin is not infected. The Vet Times review describes a related condition, pyotraumatic folliculitis, where the infection goes into the hair follicles. Signs that point to a deeper problem:
- Thickened, raised skin rather than a flat, moist patch
- Small bumps or pustules ("satellite lesions") around the edge
- A spot that keeps spreading after a few days of care
- Several spots, or fever and lethargy
These cases often need oral antibiotics, and sometimes a culture. Any sore that does not heal, keeps bleeding, or looks like a lump rather than a raw patch should be checked by a vet, as some tumors and other skin diseases can look like a stubborn wound.
Hot spot or something else?
A few other problems get mistaken for hot spots. Ringworm, a fungal infection, usually causes round, dry, scaly patches of hair loss rather than a wet, oozing one, and it can spread to people and other pets. Sarcoptic mange causes intense itch and crusting, often on the ear edges, elbows and belly, and is also contagious. A lick granuloma is a firm, thickened sore, usually on the front of a lower leg, that builds up over weeks of licking. Each needs a different treatment, so a vet check is worth it whenever the spot does not look or behave like the description above.
Dog hot spot healing stages
The Vet Times review notes that treatment typically runs 7-14 days. A rough guide to what healing looks like with treatment:
| Stage | Timing | What you see |
|---|---|---|
| Active | Before treatment | Red, wet, oozing, spreading, very painful |
| Drying | Days 1-3 | Ooze stops, surface dries, pain eases, dog bothers it less |
| Scabbing | Days 3-7 | Thin crust or scab, pink skin at the edges; it may itch, so keep the cone on |
| Closing | Week 1-2 | Scab lifts, skin underneath is pink and dry |
| Regrowth | Weeks 2-6+ | Hair grows back; skin may look darker for a while |
If the spot is still wet or growing after 2-3 days of treatment, the dog may still be reaching it, or it may be infected. Call your vet back.
How to prevent hot spots
- Year-round flea control, even in winter if your vet recommends it.
- Dry the coat to the skin after swimming, rain or baths, especially in double-coated breeds. A high-velocity pet dryer on a cool setting helps.
- Brush regularly and remove undercoat during shedding seasons to stop mats that trap moisture.
- Treat ear infections early and keep up any ear cleaning your vet prescribes.
- Control allergies, the most common long-term driver of repeat hot spots.
- Address pain and boredom with joint care, exercise and enrichment.
Can supplements prevent hot spots?
Supplements cannot heal a hot spot, and you should not rely on them for one. Their role is prevention in dogs whose hot spots come from allergic itch. Omega-3 fatty acids (EPA and DHA) have the best evidence for allergic skin in dogs, though it is moderate evidence for a small benefit; the 2015 ICADA guidelines (opens in a new tab) note any benefit may take about two months and they are not a treatment for acute flares. If your dog gets hot spots every summer, starting fish oil in spring is a reasonable, low-risk step to discuss with your vet. Owners also ask whether colostrum helps; we looked at whether colostrum can help hot spots on a separate page. More on dosing in fish oil for dogs with allergies, and the full ranking is on our allergy supplement hub.
For large, dense-coated breeds
The breeds most prone to hot spots tend to be big, which means they need a lot of EPA and DHA. Nutramax Welactin is a liquid fish oil with a dosing scoop, which makes larger doses easier than capsules. It has a fishy smell and should be stored as the label directs after opening.
Nutramax Welactin Omega-3 Liquid for Dogs (16 oz)
by Nutramax
Dogs- Form
- Liquid fish oil with dosing scoop, 16 oz
- Key actives
- Omega-3 fatty acids EPA + DHA
- Best for
- Large dogs and owners who want a vet-channel brand with an easy liquid dose
- Watch for
- Fishy smell; store as directed once opened
For an easy daily pump in multi-pet homes
Zesty Paws Wild Alaskan Pollock + Salmon Oil is a pump bottle labeled for dogs and cats, which is convenient if several pets get fish oil. The EPA + DHA per pump is lower than concentrated vet products, so check the label and confirm the amount with your vet, especially for a large dog.
Zesty Paws Salmon Oil for Dogs & Cats (32 oz)
by Zesty Paws
Dogs and cats- Form
- Pump liquid (pollock and salmon oil), 32 oz
- Key actives
- Wild Alaskan pollock and salmon oil, EPA + DHA
- Best for
- Easy daily pump for multi-pet homes; check EPA + DHA per pump on the label
- Watch for
- EPA+DHA per pump is lower than concentrated vet products, so check the label dose
FAQ
What causes hot spots on dogs?
Hot spots start when a dog licks, chews or scratches one area intensely. The itch or pain behind it usually comes from fleas, allergies, ear infections, anal gland problems, matted or damp coat, or joint pain.
Can a dog hot spot heal on its own?
A very small, early spot sometimes dries up once the licking stops, but most keep spreading because the itch keeps the dog at it. If the spot is not clearly drying within 2-3 days, or it is painful or growing, it needs a vet.
How long does a dog hot spot take to heal?
With prompt treatment, most hot spots dry out within a few days and heal in about one to two weeks. Hair takes several more weeks to regrow. Large, deep or infected lesions take longer.
Are hot spots contagious to other dogs or people?
A hot spot itself is not contagious, because it is damage the dog does to its own skin. The cause can be: fleas spread to other pets, and look-alikes such as ringworm and sarcoptic mange can spread to other animals and to people.
Can supplements prevent hot spots?
Only indirectly. If allergies are what make your dog itch, omega-3 fish oil may help with long-term allergy control over a couple of months. Supplements do nothing for an active hot spot.