Brown dog self-grooming in a dry field, relevant to hot spots on dogs
on September 18, 2026

Hot Spots on Dogs: Causes, Treatment & Prevention (UK Guide)

Short answer: hot spots (technically "pyotraumatic dermatitis") are a raw, red, oozing patch of skin caused by a dog licking, biting, or scratching one spot until it becomes a self-inflicted wound — and they can develop within 72 hours, so the trigger is usually something else entirely, not the skin itself. Below is what real veterinary research shows about who gets them and why, how they're actually treated, and how to stop them coming back.

Written by Jamie Sinclair, who writes about canine health, nutrition, and everyday care for Doggy Dailies — focused on translating veterinary research and real ingredient science into practical, honest guidance UK dog owners can use.

Table of Contents

What Exactly Is a Hot Spot?

A hot spot is an area of skin that becomes acutely inflamed, infected, and moist after a dog traumatises it through persistent licking, chewing, or scratching. It's a self-inflicted secondary injury, not a primary skin disease — something else (covered below) triggers the initial itch or discomfort, and the dog's own response to that trigger creates the wound. Hot spots can appear and worsen alarmingly fast, often expanding significantly within a day or two of the first signs.

What the Real Research Shows

A prospective study of 44 privately-owned dogs with pyotraumatic dermatitis, in a flea-scarce environment, found something genuinely useful for owners: dogs younger than four years old and male dogs were more likely to be affected (Holm et al., 2004, Veterinary Dermatology). Because the study was conducted where fleas were uncommon, it's particularly useful evidence that hot spots happen even without flea involvement — the popular assumption that hot spots are "basically a flea problem" doesn't hold up as a universal rule.

The same study found bacterial culture came back positive for Staphylococcus pseudintermedius in 25 of 27 samples tested, confirming that secondary bacterial infection is a near-universal feature once the skin barrier breaks down — which is exactly why hot spots typically need more than just cleaning to resolve. Notably, the researchers also found no significant correlation between the type of skin change under the microscope and the dog's breed, age, sex, underlying cause, or where on the body the lesion appeared — in plain terms, you genuinely can't predict how bad a hot spot will get, or why, just from looking at the dog or the location.

Does Coat Type Actually Matter? The Overlooked Nuance

Hot spots are commonly described as a problem for thick-coated, double-coated breeds specifically — Golden Retrievers, German Shepherds, St Bernards, and similar large dense-coated breeds are frequently named. There's a genuine, plausible mechanism behind this (moisture trapped against the skin under a heavy coat, especially in hot or humid weather), and these breeds are indeed commonly represented in clinical reports. But it's worth being precise about what the evidence actually supports: coat density is a plausible contributing factor in trapping moisture and heat against irritated skin, not a strict requirement — dogs of any coat type can and do develop hot spots when the underlying trigger (allergy, parasite, pain, or irritation) is present. Treating "my dog has short fur" as a reason to rule out a hot spot, or delay treatment, isn't supported by the actual mechanism.

What Actually Triggers a Hot Spot

Because a hot spot is a secondary injury, treating it without addressing what caused the original itch or irritation tends to mean it comes straight back. Common underlying triggers include:

  • Fleas and flea allergy dermatitis — a frequently reported trigger, though as above, not the only one
  • Allergic skin disease — both environmental (atopic) and food-related allergies
  • Ear infections — a dog scratching persistently at an itchy or painful ear can trigger a hot spot nearby; see our guide to ear infections in dogs if that's the underlying issue
  • Anal gland problems — irritation here can cause a dog to bite or lick at the base of the tail or hindquarters
  • Underlying joint or muscle pain — a dog may lick or chew at a painful area repeatedly, creating a hot spot over it
  • Matted or poorly groomed fur — trapping moisture and debris against the skin, particularly after swimming or bathing without thorough drying
  • Boredom, stress, or anxiety — compulsive licking at one spot, similar in mechanism to how stress can worsen general itching

Signs and Symptoms

  • A red, raw, moist patch of skin, often with hair loss in and around it
  • Rapid onset and expansion — a small irritated patch can become a significant wound within a day or two
  • Oozing, weeping, or a sticky discharge from the area
  • Visible pus or a foul odour if secondary infection is established
  • Obvious pain or sensitivity when the area is touched
  • Persistent licking, chewing, or scratching at the same spot, often more intensely than seems proportionate

How Hot Spots Are Actually Treated

Because bacterial infection is present in almost every case, effective treatment usually involves more than surface cleaning. Standard veterinary treatment typically includes:

  • Clipping the fur around the area — this lets air reach the wound and lets you (and your vet) actually see how extensive it is, since fur can hide the true size
  • Gentle cleaning of the area with a vet-recommended antiseptic solution
  • Topical or oral antimicrobial treatment — a 2005 study found a topical fusidic acid and betamethasone gel was as effective as a course of oral antibiotics and steroids over a seven-day period for many cases (Cobb et al., 2005, cited in Vet Times), meaning many straightforward hot spots don't necessarily need systemic medication
  • Addressing the underlying trigger — genuinely the most important step for preventing it from simply happening again in a few weeks

What You Can Do at Home

For a small, early-stage hot spot without significant infection, some home care alongside a vet check can help:

  • Gently trim the fur around the area if your dog will tolerate it, to expose it to air
  • Clean gently with a dog-safe antiseptic wash, not harsh human antiseptics
  • Prevent further licking or scratching where possible — a protective cone or recovery collar is often necessary short-term, unsatisfying as that usually is for the dog
  • Keep the area dry between cleanings

Given how quickly hot spots can worsen, and how consistently bacterial infection is involved, a same-day or next-day vet check is genuinely the more reliable path for most cases rather than managing entirely at home.

What Not to Do

  • Don't apply human skin creams, ointments, or steroid creams without vet guidance — some ingredients that are fine for human skin aren't appropriate for dogs, and can worsen irritation or be licked off and ingested
  • Don't cover the area with a bandage unless a vet specifically advises it — hot spots generally need air exposure to heal, and covering a moist wound can trap infection in rather than out
  • Don't assume it will resolve on its own — because bacterial infection is involved in almost every case, an untreated hot spot is more likely to expand than to quietly heal

Preventing Recurrence

Since hot spots are a symptom of something else rather than a standalone problem, genuine prevention means identifying and managing the actual trigger — flea prevention if that's relevant, allergy management if it's allergy-driven, regular ear checks if ear irritation is the cause, and thorough drying after swimming or baths for any dog, regardless of coat type. Our guide to itchy skin in dogs covers the allergy side of this in more depth, since allergic skin disease is one of the most common underlying drivers.

When to See a Vet

See a vet promptly if you notice:

  • Any hot spot larger than a coin, or one that's expanding
  • Visible pus, a strong odour, or significant pain
  • A hot spot that hasn't started improving within a couple of days of starting home care
  • Recurring hot spots — this points to an unaddressed underlying trigger worth properly investigating
  • Your dog seems generally unwell alongside the skin issue (lethargy, reduced appetite)

FAQ

What causes hot spots on dogs?

A hot spot forms when a dog licks, bites, or scratches one area persistently, usually triggered by an underlying cause like fleas, allergies, ear infections, anal gland irritation, or pain elsewhere on the body.

Are hot spots only a problem for thick-coated dogs?

No. While dense, double-coated breeds are commonly affected due to trapped moisture, dogs of any coat type can develop hot spots when an underlying trigger like allergy or parasites is present.

Are hot spots always caused by fleas?

No. Research on dogs in flea-scarce environments found hot spots still occurred, confirming other causes like allergies, ear infections, and pain are equally valid triggers.

How fast do hot spots develop?

Very quickly — a hot spot can appear and expand significantly within 72 hours, which is why prompt attention matters more than with many other skin issues.

Can I treat a dog's hot spot at home?

Small, early-stage hot spots can sometimes be managed with gentle cleaning and preventing further licking, but because bacterial infection is present in almost every case, a vet check is the more reliable path for most dogs.

Should I bandage my dog's hot spot?

Not unless specifically advised by a vet. Hot spots generally need air exposure to heal, and covering a moist wound can trap infection rather than help it.

Sources

This article is for general information only and isn't a substitute for veterinary advice. If your dog has a red, raw, or expanding patch of skin, please contact your vet rather than treating it entirely at home.

Related: More Skin & Everyday Care Guides