Hot spots (acute moist dermatitis) are one of the most common and distressing skin conditions in dogs. They appear suddenly — seemingly overnight — as red, oozing, painful areas of skin that the dog obsessively licks, chews, or scratches. Within hours, a small irritation can expand into a large, angry lesion. Understanding what triggers hot spots and how to break the itch-scratch cycle is essential for prevention.
What Is a Hot Spot
A hot spot is a localized area of acute bacterial skin infection (superficial pyoderma) caused by self-trauma. The cycle: something irritates the skin → the dog scratches/licks/chews → breaks the skin surface → bacteria (Staphylococcus) colonize → infection creates more itching → more self-trauma → rapid expansion.
Common Triggers
- Allergies (most common): Atopic dermatitis, flea allergy, food allergy — any itch source can trigger a hot spot
- Moisture: Swimming, rain, inadequate drying. Trapped moisture under dense coats creates perfect bacterial conditions.
- Insect bites: Flea bites, mosquito bites, fly bites
- Ear infections: Dogs scratching at painful ears create hot spots below/behind ears
- Anal gland problems: Dogs chewing at their hind end create perianal hot spots
- Matted fur: Traps moisture and debris against skin
- Boredom/stress: Psychogenic licking creating self-trauma
Treatment
At Home (Mild Cases)
- Clip the hair around and over the hot spot (allows air exposure and medication contact). The lesion is often much larger than it appears under matted, wet fur.
- Clean with dilute chlorhexidine (0.05%) or saline solution
- Apply topical antibiotic spray or cream (veterinary-approved)
- E-collar: Mandatory. The dog MUST be prevented from licking/chewing. This is the most important step.
- Keep dry — no swimming, no wet conditions
Veterinary Treatment (Severe/Large Cases)
- Sedation for clipping and cleaning (hot spots are extremely painful)
- Oral antibiotics (10-14 days) for deep or spreading infection
- Oral steroids (short course) or Apoquel to break the itch cycle
- Pain management
- Diagnostic workup for underlying cause if recurrent
Breeds Most Affected
Breeds with dense undercoats and/or high allergy rates: Golden Retrievers, Labrador Retrievers, German Shepherds, St. Bernards, Rottweilers, English Bulldogs.
Prevention
- Dry thoroughly after swimming or bathing
- Regular grooming (prevent matting)
- Year-round flea prevention
- Manage underlying allergies
- Treat ear infections promptly
- Regular anal gland expression if prone to impaction
Frequently Asked Questions
Can I use Neosporin on a hot spot?
It won't hurt for tiny spots, but it's minimally effective for true hot spots because the infection is spread across a larger area than topical cream can penetrate, and the dog will lick it off. Proper treatment requires clipping, cleaning, E-collar, and often systemic antibiotics.
