A hot spot is a patch of acute moist dermatitis that can appear and spread within hours, leaving skin red, wet, painful and losing hair. Late summer in Dunbar-Southlands brings damp coats, humidity, fleas and pollen, so licking escalates quickly. Because a hot spot signals an underlying itch, it warrants a veterinary exam.
What a Hot Spot Actually Is
A hot spot, known clinically as acute moist dermatitis, is a small area of inflamed and infected skin that your pet has created themselves. Repeated licking, chewing or scratching in one place breaks the skin surface, and the warm damp environment that follows lets normal skin bacteria multiply far beyond their usual numbers.
What surprises most owners is the speed. A coat that looked completely normal at breakfast can hide a weeping patch the size of a coin by dinner, and that patch can double in size overnight. The hair mats down over the surface or pulls away entirely, the edges look sharply defined and angry, and the area is genuinely sore to touch.
Because the lesion is painful, some usually gentle dogs will flinch, pull away or snap when the spot is handled. If the area is clearly growing, if your pet cannot settle, or if there is a foul smell or discharge, that is a reason to arrange urgent care the same day rather than watching it over a weekend.
Why Late Summer Is Peak Season in Dunbar-Southlands
August into early September is when several triggers stack on top of each other in this part of Vancouver. Individually none of them causes a hot spot; together they create exactly the conditions a hot spot needs.
- Damp coats after swimming. Dogs coming back from Spanish Banks or the Fraser River foreshore below Southlands often stay wet at skin level for hours, long after the topcoat feels dry to your hand.
- Late summer rain and humidity. The first wet stretches return while temperatures are still warm, and a shaded trail through Pacific Spirit Regional Park keeps a coat damp for a whole walk.
- Peak flea exposure. Flea populations reach their yearly high in late summer, and a single bite on a sensitive dog can start the scratching that becomes a lesion.
- Peak pollen and grass seed. Late season grasses and weeds mean itchy feet, flanks and bellies, so pets are already licking more than usual.
- Thick undercoats. Coats that have not fully shed hold moisture flat against the skin, and mats behind the ears, under the collar and around the tail base trap it there.
A Hot Spot Is Almost Always a Symptom
This is the single most useful thing to understand. The lesion you can see is the end of a chain, not the beginning of one. Something made your pet itch first, and the hot spot is simply where the itching landed.
Common drivers include flea bites, environmental allergens such as pollen and grass, an ear infection that has a dog scratching at the side of the face and neck, discomfort near the tail base, a food sensitivity, or simple trapped moisture. Joint pain can also do it, because some dogs lick persistently over a sore hip or elbow.
That is why treating only the visible patch tends to end in a repeat episode a few weeks later. Since fleas are one of the most common triggers we see, keeping a pet on year-round flea prevention and control removes one link from the chain. If you are not sure where your pet sits with that, our guide on when to start flea prevention is a useful companion read.
Hot Spot, Bite Wound or Abscess
These three look similar under a coat, and they are managed quite differently, which is why guessing at home is risky.
A hot spot is surface level and self-inflicted. It is wet, red, hair is missing, and the story usually starts with itching. A bite wound is a puncture from an encounter with another animal, and the visible opening is often tiny while the damage underneath is not. An abscess is a pocket of infection under the skin, so it feels like a firm or squishy swelling rather than an open sore, and a pet with one may be off their food, quiet or feverish. Cats who spend time outdoors are especially prone to abscesses after a scuffle.
Only a hands-on exam can tell you which one you are looking at, and the wrong assumption costs days.
Why Thick-Coated Breeds Are at Higher Risk
Retrievers, shepherds, huskies, collies, Bernese and Newfoundlands all carry a dense undercoat designed to insulate, which means it also holds water. Long-haired cats are not exempt either. After a swim or a rainy walk, that undercoat can keep the skin damp for hours in warm weather, and moisture plus warmth plus a little friction is the whole recipe.
Mats make it worse by sealing the area off from air completely. If your pet’s coat is matting behind the ears, in the armpits or around the rear, booking grooming services before the mats tighten is far kinder than dealing with the skin underneath later. Please do not clip or shave a sore area yourself. Inflamed skin is fragile and tents up under a blade, household scissors cut it easily, and a painful pet moves at the worst moment.
Why the Licking Has to Stop First
Nothing you or your veterinarian does will hold if the pet keeps working at the spot. Licking re-wets the surface, spreads bacteria, and adds fresh trauma, which increases the pain and the itch, which drives more licking. The cycle runs faster than healing does.
A properly fitted recovery collar or body suit is the usual answer, and the clinic can size one so it actually covers the area without distressing your pet. Avoid improvising with tight wraps, tape or a snug bandage at home, because covering a moist infection without airflow generally makes it worse.
Why Human Creams and Home Remedies Often Backfire
This is where a manageable problem often turns into a complicated one. Please do not reach for hydrogen peroxide, rubbing alcohol, human antiseptic creams, human steroid or hydrocortisone creams, antifungal creams from the bathroom cabinet, or essential oils such as tea tree oil.
The reasons are practical. Alcohol and peroxide sting badly on raw skin and damage the tissue that needs to repair. Thick ointments seal moisture in against an already wet lesion. Pets lick topical products off within minutes, so whatever you apply is swallowed, and several ingredients that are harmless on human skin are not safe when ingested by a dog or cat. Human steroid creams can also flatten the appearance of the lesion just enough to make the exam harder to interpret. If something is already on the skin when you call, tell the team exactly what it was.
What a Veterinary Visit Typically Addresses
An appointment for a hot spot is usually more thorough than owners expect, because the goal is to settle the lesion and find the reason it happened.
- A full skin and coat exam, not just the visible patch, since quiet second and third sites are common.
- An ear check, because ear discomfort is a frequent driver of head and neck lesions.
- A flea check, including combing for flea dirt, even on indoor pets.
- Sampling of the surface where appropriate, so the team can see what type of organisms are involved rather than assuming.
- Careful clipping and cleaning of the area by the team, with pain relief or sedation if the spot is too sore to handle comfortably.
- A treatment plan suited to that individual pet, plus a plan for the underlying trigger so the same thing does not recur next August.
Ongoing skin problems fall under dermatology care, which is where recurring itch, chronic irritation and allergy investigation are worked through properly. In British Columbia, veterinary medicine is regulated by the College of Veterinarians of British Columbia, and prescription treatment follows an in-person assessment of your specific pet, which is why no article can tell you what to put on the skin.
Frequently Asked Questions
How fast can a hot spot really appear?
Hours, not days. Many owners find nothing unusual in the morning and a wet, hairless, painful patch that evening. That speed is the reason a spot noticed on Saturday should not be left until the following week.
Can I treat a hot spot at home?
No, home treatment is not appropriate for an open, infected skin lesion. Keeping your pet from licking and preventing further trauma is helpful while you arrange an appointment, but cleaning solutions, human creams and clipping should be left to the veterinary team.
Do cats get hot spots too?
Yes, although they present differently. Cats are private groomers, so the damage is often hidden under a long coat or found as a bald, scabby area over the back, neck or belly. Fleas and matted fur are frequent contributors.
Will the area need to be clipped?
Usually yes, and that is done at the clinic. Hair traps moisture and discharge over the lesion, so clearing the coat around it lets the skin dry and lets the team see the true size, which is often larger than it looks through fur.
How can I lower the risk after swims and rainy walks?
Dry your pet down to skin level rather than just the topcoat, paying attention to the neck, armpits, groin and tail base. Keep the coat free of mats through late summer, stay consistent with parasite prevention, and check the skin with your hands after wet outings. Our local trail safety guide covers more on outdoor exposure.
Have a Red, Wet Patch Appeared Overnight
Do not wait to see whether it settles on its own, because hot spots rarely do. Part the fur, note how big the area is today, keep your pet from licking it, and book an appointment with Dunbar Animal Hospital so the skin can be assessed and the underlying itch identified. Our team sees dogs and cats from across Dunbar-Southlands and the surrounding Vancouver neighbourhoods.
Published by the team at Dunbar Animal Hospital.
This article is provided for general educational purposes only and is not a substitute for an in-person veterinary exam, diagnosis or treatment. If your pet has an urgent concern, please contact Dunbar Animal Hospital during opening hours, or your nearest 24 hour emergency veterinary hospital outside of them.
Dunbar Animal Hospital
3518 W 41st Ave, Vancouver, BC, V6N 3E6, Canada
+1 (604) 434-0018
Monday to Saturday: 8:30 AM – 8:00 PM
Sunday: 9:00 AM – 8:00 PM
Closed on statutory holidays