Hot Spots in Dogs - Rapidly Developing Skin Inflammation

Hot Spots in Dogs - Rapidly Developing Skin Inflammation

Important note: Fidello is not a veterinarian. This page is intended to inform you and does not provide a diagnosis. If you have any doubts about your dog's health, or recognise the signs described below, always contact a veterinarian.

A hot spot is one of the most common acute skin problems in dogs: a spot that looks completely normal in the morning can turn into a red, moist and painful wound by evening. Vets also call this acute moist dermatitis or pyotraumatic dermatitis. It's a superficial skin infection that develops when a dog damages its own skin through licking, scratching or biting, usually because itching or irritation is already present somewhere else.

What Is a Hot Spot?

A hot spot develops when the skin barrier in one area becomes damaged through persistent licking, scratching or biting. Bacteria that normally live harmlessly on a dog's skin, particularly Staphylococcus pseudintermedius, can multiply rapidly once the skin is broken. This causes a superficial but intense inflammation: the skin turns red, moist and swollen, and often loses hair in that spot. The speed is what stands out - a hot spot can appear within hours and grow considerably larger, because the itching and pain drive the dog to lick and scratch even more, creating a vicious cycle.

Which Dogs Are at Risk?

Hot spots can occur in any dog, but are seen more often in breeds with a thick, moisture-retaining coat, such as the Golden Retriever, Labrador Retriever, German Shepherd, Saint Bernard and Rottweiler. In these breeds, moisture from swimming, bathing or wet weather stays trapped against the skin for longer, increasing the risk of skin irritation. Warm, humid weather and the summer months are also linked to more reported cases of hot spots. A hot spot is almost always the result of an underlying trigger: flea allergy (the most commonly reported cause), atopic dermatitis or food allergy, an ear infection, anal gland problems, mite infestations, irritation after grooming or clipping, or a mat or trapped object in the coat. Without addressing that underlying cause, hot spots often keep coming back.

Symptoms

A hot spot often starts as a small, moist, red patch, usually on the head, flank, hip or legs, that can grow strikingly quickly - going from a minor irritated spot to a wound the size of a palm within a matter of hours. The area is sharply defined, red, moist and either painful or intensely itchy, may lose hair, and sometimes oozes fluid or pus. Dogs often lick, scratch or bite at the spot intensively, which makes the condition worse. Signs that call for urgent attention include a rapidly spreading patch or one larger than a couple of centimetres, an unpleasant odour, fever, lethargy, or a dog that is clearly in a lot of pain.

When to See a Vet?

Contact the vet as soon as you notice a hot spot: the sooner the underlying cause is treated, the faster the spot heals. Ideally, have your dog seen the same day, or otherwise within 24 to 48 hours, especially if the patch is larger than a couple of centimetres, is growing quickly, smells unpleasant, or your dog clearly seems unwell. Don't wait and see if the spot keeps spreading or becomes more painful - hot spots can get significantly worse in a short space of time.

How Is It Diagnosed?

A vet can usually recognise a hot spot on physical examination alone, from its sharply defined, moist and painful appearance. To identify the underlying cause, the vet may clip the fur around the area, examine the skin under a microscope (an impression smear) to assess the bacteria present, and look for signs of fleas, mites, allergy or an ear infection. If a fungal infection is suspected, further testing may be needed, since the treatment differs in that case. This page cannot determine whether your dog has a hot spot or what the underlying cause is; only a vet can assess that after an examination.

Treatment Overview

The vet decides on the treatment. This usually involves clipping the fur around the area so air can reach it and it can be kept clean, cleansing the skin with a suitable product, and, where needed, a topical or, for deeper infections, oral antibacterial treatment. Just as important is tackling the underlying cause, such as flea control, allergy treatment or treating an ear infection, to prevent the hot spot from returning. A protective collar is often recommended too, so the dog can't keep licking or scratching at the area. With appropriate treatment, a hot spot usually clears up within a few days to about a week.

What You Can Do Yourself

Stop your dog from licking or scratching the area further, for example with a protective collar, so the skin gets a chance to heal. Keep the fur around the spot short and clean as advised by the vet, and use only products the vet has recommended - home remedies can make the irritation worse. Dry your dog thoroughly after swimming or bathing, especially with a thick or double coat, and brush the coat regularly to prevent matting and trapped moisture. This does not replace veterinary treatment.

Prevention

Since hot spots almost always have an underlying trigger, consistent flea and tick control is one of the most important preventive measures. Treat allergies and ear infections promptly and according to the vet's advice, keep the coat brushed regularly and free of mats, and dry a wet coat thoroughly, especially in breeds with a dense undercoat. During warm, humid periods, watch closely for early signs of skin irritation so you can act quickly before a hot spot develops.

Frequently Asked Questions

Is a hot spot contagious to other pets?
The hot spot itself is usually a bacterial infection and is not contagious. However, if the underlying cause is a parasite such as a mite, or a fungal infection, that cause can be transmissible to other pets; the vet can determine this.

Why does a hot spot spread so quickly?
Because the area itches or hurts, dogs tend to lick and scratch at it even more, which damages the skin further and speeds up the inflammation. This vicious cycle is why a hot spot can become noticeably larger within just a few hours.

Does a hot spot only happen once?
Not necessarily. As long as the underlying cause, such as an allergy or flea problem, hasn't been addressed, a dog can develop hot spots again.

Can I treat a hot spot myself at home?
Discuss this with the vet first. Without the right diagnosis and treatment of the underlying cause, a hot spot often doesn't heal for good, and the wrong products can make the irritation worse.

Conclusion

A hot spot is an acute, fast-developing skin infection that can occur in almost any dog, but is seen more often in breeds with a thick, moisture-retaining coat. Good management comes down to two things: having the vet treat the spot itself, and identifying and addressing the underlying cause, such as an allergy or flea problem. With a timely vet visit and attention to the underlying trigger, a hot spot usually heals quickly and without lasting effects.

Finally

In closing: this article does not replace a visit to the vet. Fidello does not provide diagnoses or prescribe treatments. If in doubt, if symptoms persist, or if there are acute signs, a veterinarian is always the right next step.