Hot spots have a reputation for showing up seemingly overnight, and that reputation is earned — a small irritation can turn into an angry, weeping patch of skin within a matter of hours if a dog keeps licking or scratching at it.
What’s actually happening
A hot spot starts with an itch or irritation (from an allergy, an insect bite, a matted patch of fur trapping moisture, or an underlying skin infection), and a dog’s response — licking, chewing, or scratching at the spot — creates a self-reinforcing cycle: the licking irritates the skin further, which increases the itch, which prompts more licking. Bacteria on the skin surface take advantage of the broken skin barrier, leading to the red, moist, often foul-smelling infected patch that defines a hot spot.
Common underlying triggers
- Flea allergies are one of the most common triggers, even from a small number of bites in a flea-sensitive dog
- Environmental or food allergies causing general itchiness that concentrates into one hot spot area
- Matted fur trapping moisture and bacteria against the skin, especially in dogs with thick or long coats, particularly after swimming or bathing without full drying
- Ear infections can trigger a hot spot near the ear from associated scratching
- Underlying anxiety or boredom-driven licking, similar to how paw licking can become compulsive in some dogs
What treatment typically involves
A vet visit for an established hot spot typically involves clipping the fur around the area (to let air reach the skin and prevent trapped moisture), cleaning the site, and often a topical or oral medication to address the infection and reduce inflammation. Identifying and addressing the underlying trigger (fleas, allergies, an ear infection) is just as important as treating the visible hot spot itself, or it’s likely to recur.
Prevention, once you know the trigger
- Consistent flea prevention removes one of the most common triggers entirely
- Thorough drying after baths or swimming, especially for dogs with thick or double coats
- Regular grooming to prevent matting, particularly in long-haired breeds
- Addressing known allergies proactively, under your vet’s guidance, rather than only reacting once a hot spot has already developed
Frequently asked questions
Are hot spots contagious to other pets?
No, hot spots themselves aren’t contagious — they’re a localized skin reaction, not an infectious disease that spreads between animals. If multiple pets in a household develop them around the same time, it’s more likely they share an environmental trigger (fleas, for instance) rather than passing it to each other directly.
Can I treat a hot spot at home without a vet visit?
For a very small, early-stage spot, gentle cleaning and preventing further licking (with supervision or an e-collar) might be enough, but hot spots can worsen quickly, so a vet visit is the safer default, especially if it’s spreading, worsening, or the underlying cause isn’t obvious.
