June Dog Skin Care: Summer Heat, Swimming Prep, and Hot Spot Prevention

Based on peer reviewed veterinary research · For educational purposes only · Updated October 2026 · 8 min read

What Does June Mean for Your Dog's Skin?

June is the month when heat, humidity, water exposure, and parasite activity all peak together, which makes it the highest-risk period of the year for moist skin lesions in dogs. Warm, damp skin is a better environment for bacteria and yeast than cool, dry skin, and a dog that is panting, swimming, and scratching in the same week is placing a lot of stress on the skin barrier.

The skin of a dog is also structurally different from human skin. The outer layer (the stratum corneum) is thinner, so it loses its protective function more quickly when it is soaked, abraded, or inflamed. Once that barrier is compromised, resident organisms such as Staphylococcus pseudintermedius (the most common bacterial skin pathogen in dogs) and Malassezia pachydermatis (a yeast) can multiply on the surface and trigger superficial infection (Hillier et al., 2014).

Dogs with an existing allergic tendency are affected most. Canine atopic dermatitis and flea allergy both produce itch, and itch produces self-trauma. In June, the environmental load is higher, so a dog that was comfortable in April can become a recurrent scratcher within weeks. Understanding the month as a stack of overlapping stressors, rather than a single problem, is the first step toward preventing the lesions. For the lead-up to this season, see our May Dog Skin Care guide.

What Causes Hot Spots and Summer Skin Flares?

Hot spots, clinically called acute moist dermatitis or pyotraumatic dermatitis, are caused by a cycle of itch, self-trauma, and secondary bacterial overgrowth. The initial trigger is often small: a flea bite, a patch of trapped moisture under a dense coat, an ear problem, or an anal gland irritation. The dog licks or chews the area, the skin surface breaks down, and exudate (moist discharge) keeps the area wet and inflamed.

In summer the most common underlying triggers are flea allergy dermatitis, environmental allergy, and retained moisture after swimming or bathing. Thick-coated breeds such as Golden Retrievers, Labrador Retrievers, and Saint Bernards are overrepresented because moisture and heat stay close to the skin beneath the coat. A single flea bite can provoke intense itch in a flea-allergic dog, and a female flea can lay up to 40 to 50 eggs per day (Rust & Dryden, 1997), so exposure builds quickly through June.

Humidity also affects yeast. Malassezia overgrowth tends to concentrate in skin folds, between the toes, and around the ears, where heat and moisture combine. Dogs with seasonal itch often carry bacteria and yeast at the same time, which is why topical therapy that addresses both organism types is commonly discussed in the literature (Mueller et al., 2012).

How Do Veterinarians Diagnose a Summer Skin Problem?

Diagnosis starts with the pattern of the lesion and is confirmed by skin cytology, a quick in-clinic test in which a sample is stained and examined under the microscope. Cytology shows whether bacteria, yeast, or inflammatory cells predominate, which determines whether an antibacterial, antifungal, or combined approach is appropriate (Hillier et al., 2014).

The distribution of the itch is also informative. Itch concentrated at the lower back and tail base points toward fleas. Itch focused on the paws, face, and underbelly suggests environmental allergy (Bruet et al., 2012). Itch plus head shaking suggests an ear problem that may be fueling a neck or cheek hot spot.

A veterinarian will also check for the underlying driver, since treating only the surface lesion can lead to recurrence. If you want a structured starting point before the appointment, our Dog Skin Condition Checker helps you describe what you are seeing, but it does not replace an examination.

Signs and Symptoms to Watch For

The early signs of a summer skin problem are persistent licking, a damp or matted patch of fur, localized redness, and a sour or musty odor. Hot spots can expand from a coin-sized area to a palm-sized wound within hours, so early recognition matters.

Swimming Prep and Summer Prevention Steps

The most effective prevention is to keep the skin dry, the coat clean, and parasites controlled before itch ever begins. A few habits make a measurable difference in June.

Before swimming, brush out loose undercoat and mats, since matted fur holds water against the skin. After swimming, rinse the coat with fresh water to remove pond, pool, or salt residue, then dry the ears, armpits, groin, and skin folds. For dogs that swim repeatedly, see our guide to skin care for repeated water exposure.

Keep year-round flea prevention current, as a veterinarian recommends, and clip or thin heavy coats only on veterinary or groomer advice, since the coat also protects against sunburn. Check the skin weekly by parting the fur along the back, belly, and base of the tail. A routine antiseptic bath can be part of a plan for dogs with a history of recurrent surface infection: Chlorhexidine Shampoo contains chlorhexidine gluconateand ketoconazole. Chlorhexidine disrupts bacterial cell membranes, while ketoconazole inhibits ergosterol synthesis in the Malassezia cell membrane. It is an FDA-registered OTC veterinary drug listed on DailyMed, and it should be used as directed on the label and alongside veterinary guidance for any active infection.

What Are the Treatment Options for a Summer Skin Infection?

Treatment of a superficial bacterial or yeast skin infection combines control of the underlying trigger with topical antimicrobial therapy, and the guidelines favor topical therapy where lesions are localized or superficial. The 2014 international guidelines state that topical antiseptics, including chlorhexidine shampoos, are appropriate for superficial pyoderma and may reduce the need for systemic antibiotics (Hillier et al., 2014).

A typical approach includes trimming the fur around the lesion, cleaning gently, preventing the dog from licking (an e-collar is often used), and treating the cause, whether fleas, allergy, or an ear problem. Where bacterial skin infection is confirmed, see our bacterial skin infections in dogs page. Contact time matters for medicated shampoos, and manufacturers' label directions should be followed.

Deep, painful, or rapidly spreading lesions usually need a veterinary visit, since systemic therapy or pain relief may be required. Never apply human steroid or antibiotic products to an open wound without veterinary advice.

Long-Term Management Through the Summer

Long-term management means treating the cause, not only the lesion, and keeping a consistent routine through the season. Dogs with environmental allergy benefit from a diagnosis-led plan under veterinary supervision, as outlined in the updated ICADA guidelines (Olivry et al., 2015). Dogs with a history of fold or surface infection often do best with regular skin checks, drying habits, and a schedule for maintenance bathing agreed with their veterinarian.

Keep a simple log of flare dates, triggers, and what helped. Patterns, such as flares after lake days or during humid weeks, make it easier for a veterinarian to build a plan that works. Review the next month in our seasonal skin care series as conditions change.

Frequently Asked Questions

What is a hot spot on a dog?

A hot spot, or acute moist dermatitis, is a rapidly developing, red, wet, painful skin lesion caused by licking or scratching and secondary bacterial overgrowth. It can enlarge within hours.

Why does my dog get more skin problems in June?

Heat, humidity, swimming, and peak flea activity combine in June. Moist skin and itch-driven self-trauma favor bacteria and Malassezia yeast, especially in dogs with allergies.

Should I rinse my dog after swimming?

Yes. Rinse with fresh water to remove pool, pond, or salt residue, then dry the ears, armpits, groin, and skin folds. Trapped moisture favors skin infection.

Can I use chlorhexidine shampoo on my dog?

Chlorhexidine is a guideline-supported topical antiseptic for superficial bacterial skin infection (Hillier et al., 2014). Follow the label directions and ask your veterinarian first for any active or deep infection.

Sources

1. Hillier A, Lloyd DH, Weese JS, et al. Guidelines for the diagnosis and antimicrobial therapy of canine superficial bacterial folliculitis. Veterinary Dermatology. 2014;25(3):163-e43.
2. Mueller RS, Bergvall K, Bensignor E, Bond R. A review of topical therapy for skin infections with bacteria and yeast. Veterinary Dermatology. 2012;23(4):330-e62.
3. Rust MK, Dryden MW. The biology, ecology, and management of the cat flea. Annual Review of Entomology. 1997;42:451-473.
4. Bruet V, Bourdeau PJ, Roussel A, Imparato L, Desfontis JC. Characterization of pruritus in canine atopic dermatitis, flea bite hypersensitivity and flea infestation and its role in diagnosis. Veterinary Dermatology. 2012;23(6):487-e93.
5. Olivry T, DeBoer DJ, Favrot C, et al. Treatment of canine atopic dermatitis: 2015 updated guidelines from the International Committee on Allergic Diseases of Animals (ICADA). BMC Veterinary Research. 2015;11:210.

Related Reading

• May Dog Skin Care: Flea Season Begins, Grass Allergies, and Sun Exposure
• Dock Diving Dogs: Skin Care for Repeated Water Exposure and Pool Chemicals
• April Dog Skin Care: Peak Pollen, Rain, and Outdoor Allergy Triggers

E. Maddens

Founder of Vetified. Develops topical antifungal and antimicrobial formulations for companion animals. Vetified products are listed on DailyMed and manufactured through FDA-registered facilities in the United States.

Research basis: All Vetified content references peer reviewed research published in journals including Veterinary Dermatology, JAVMA, and Journal of Small Animal Practice.