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 help you reach a diagnosis. If you're unsure about your dog's health, or recognize the signs described below, always contact a veterinarian.

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

What is a hot spot?

A hot spot develops when the skin barrier is damaged in one spot through persistent licking, scratching or biting. Bacteria that normally live harmlessly on a dog's skin, particularly Staphylococcus pseudintermedius, can multiply rapidly in the damaged skin. This causes a superficial but intense inflammation: the skin becomes red, moist and swollen, and often loses hair in that area. A defining feature is the speed: a hot spot can develop within a few hours and grow considerably in size, 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 dense, moisture-retaining coat, such as the Golden Retriever, the Labrador Retriever, the German Shepherd, the Saint Bernard and the Rottweiler. In these breeds, moisture from swimming, bathing or wet weather stays against the skin for longer, increasing the risk of skin irritation. Warm, humid weather and the summer season are also linked to more reports of hot spots. A hot spot is almost always the result of an underlying trigger: flea allergy dermatitis (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 foreign object caught in the coat. Without addressing that underlying cause, hot spots often reappear.

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 small irritated spot to a wound the size of a palm within a few hours is possible. The area is well-defined, red, moist and either painful or intensely itchy, may lose hair, and can sometimes discharge fluid or pus. Dogs often lick, scratch or bite intensively at the spot, which makes the condition worse. Signs that call for urgent attention are: 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 the veterinarian?

Contact the veterinarian as soon as you notice a hot spot: the sooner the underlying cause is treated, the faster the spot heals. Have your dog assessed preferably 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 if your dog is clearly unwell. Don't wait if the area keeps spreading or becoming more painful: hot spots can worsen considerably in a short time.

How is it diagnosed?

A veterinarian usually recognizes a hot spot on physical examination, from its well-defined, moist and painful appearance. To identify the underlying cause, the veterinarian may clip the coat around the spot, examine the skin under a microscope (an impression smear) to assess bacteria, 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 would then differ. This page cannot determine whether your dog has a hot spot or what the underlying cause is; only a veterinarian can establish that after examination.

Treatment in outline

The veterinarian determines the treatment. It usually consists of clipping the coat around the spot so air can reach it and it can be kept clean, cleaning the skin with a suitable product, and, if needed, local or, for deeper infections, oral antibacterial treatment. Just as important is addressing the underlying cause, such as flea control, allergy treatment or treating an ear infection, to prevent recurrence. A protective collar is often recommended as well, so the dog cannot keep licking or scratching the spot. With appropriate treatment, a hot spot usually clears up within a few days to about a week.

What you can do yourself

Prevent your dog from continuing to lick or scratch the spot, for example with a protective collar, so the skin gets the chance to heal. Keep the coat around the spot short and clean as advised by the veterinarian, and use only products the veterinarian has recommended; home remedies can make the irritation worse. Dry your dog thoroughly after swimming or bathing, especially with a dense or double coat, and brush the coat regularly to prevent matting and trapped moisture. This does not replace veterinary treatment.

Prevention

Because 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 as advised by the veterinarian, brush the coat regularly to keep it free of mats, and dry a wet coat thoroughly, especially in breeds with a dense undercoat. During warm, humid periods, pay extra attention to 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 inflammation and is not contagious. If the underlying cause is a parasite such as a mite, or a fungal infection, that cause can be transmissible to other pets; the veterinarian can determine this.

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

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

Can I treat a hot spot myself at home?
Discuss this with the veterinarian first. Without the correct diagnosis and treatment of the underlying cause, a hot spot often does not heal permanently, and the wrong products can make the irritation worse.

Conclusion

A hot spot is an acute, rapidly developing skin inflammation that can occur in almost any dog, but is seen more often in breeds with a dense, moisture-retaining coat. The key to a good approach is twofold: having the spot itself treated by the veterinarian, and identifying and addressing the underlying cause, such as an allergy or a flea problem. With prompt veterinary attention and awareness of the underlying trigger, a hot spot usually heals quickly and without lasting effects.

Finally

Finally: this article does not replace a visit to the veterinarian. Fidello does not provide diagnoses or prescribe treatments. If in doubt, or if symptoms persist or appear urgent, a veterinarian is always the right next step.