Dog Ear Infections After Swimming: Prevention and Drying Tips

By Emiel Maddens  ·  Reviewed in consultation with licensed veterinary professionals  ·  Updated April 2026  ·  11 min read

Photo by Tima Miroshnichenko on Pexels

Dogs love water, but their ear anatomy makes them uniquely vulnerable to infections after swimming. Unlike human ear canals, which run horizontally to the eardrum, a dog's ear canal is shaped like the letter L, with a vertical section that drops down and a horizontal section that turns inward toward the eardrum. This shape means water that enters the ear during swimming gets trapped at the bottom of the bend and does not drain out easily on its own.

Water trapped in the ear canal creates the perfect conditions for bacterial and yeast overgrowth: it is warm, dark, and moist. Within 24 to 48 hours of water exposure, organisms can multiply rapidly and trigger an infection. The good news is that post-swim ear infections are largely preventable with the right ear care routine. This article explains exactly why swimming causes ear infections and gives you a step-by-step approach to keeping your dog's ears healthy through swim season.

Why Swimming Leads to Ear Infections in Dogs

Understanding the specific mechanisms that connect water exposure to ear infections helps explain why simple post-swim ear care is so effective at preventing them. The problem is not water itself but what happens when moisture remains in the ear canal long enough for organisms to take hold.

The L-Shaped Ear Canal Traps Water

A dog's ear canal consists of a vertical section visible from the outside and a horizontal section that turns sharply inward. When water enters during swimming, it flows down the vertical canal and pools at the junction where the canal bends. Head shaking can remove some water but often fails to clear the horizontal portion completely. This retained moisture is the primary problem.

Warm, Moist Conditions Promote Microbial Growth

The ear canal is already warm from body heat, and adding moisture creates optimal conditions for bacteria like Staphylococcus and Pseudomonas, as well as yeast like Malassezia. These organisms are normally present in small numbers on healthy ear tissue, but the prolonged moisture allows them to multiply beyond what the ear's natural defenses can control.

Water Disrupts the Ear's Protective Wax Layer

The ear canal produces cerumen (ear wax) that has antimicrobial properties and forms a protective barrier on the canal lining. Repeated water exposure washes away this protective layer, leaving the skin of the canal more vulnerable to colonization by bacteria and yeast. Dogs that swim daily may lose this protective layer faster than their ears can replenish it.

Contaminated Water Introduces Additional Organisms

Lake water, pond water, and even pool water can contain bacteria that are not normally present in a dog's ear. Stagnant or warm natural water bodies are particularly rich in Pseudomonas and other environmental bacteria. Introducing these organisms directly into a warm, moist ear canal significantly increases infection risk compared to clean water alone.

Floppy Ears and Heavy Ear Hair Compound the Problem

Dogs with pendulous ear flaps have reduced airflow to the ear canal, which means trapped water evaporates much more slowly. Dogs with heavy ear hair also retain moisture because the hair acts like a wick that holds water against the canal lining. Breeds with both features, like Cocker Spaniels and Poodles, face the highest risk from swimming-related ear infections.

Thoroughly drying your dog's ears after every swim is the single most effective step you can take to prevent swimmer's ear infections.

Photo by Karsten Winegeart on Unsplash

Risk Factors That Make Some Dogs More Susceptible

While any dog can develop an ear infection after swimming, certain physical characteristics and health conditions make some dogs much more vulnerable than others. Knowing whether your dog falls into a high-risk category helps you decide how vigilant to be with post-swim ear care.

1. Ear Shape and Size

Dogs with long, floppy ears have significantly less airflow to the ear canal than dogs with erect ears. This means moisture evaporates slowly and organisms have more time to proliferate. Cocker Spaniels, Basset Hounds, Labrador Retrievers, Golden Retrievers, and Beagles are all at elevated risk. Dogs with erect ears like German Shepherds have somewhat better ventilation but are not immune.

2. Dense Ear Hair

Breeds like Poodles, Bichon Frises, and Schnauzers grow dense hair inside the ear canal. This hair retains water after swimming and holds it against the canal lining for extended periods. Some groomers remove this hair to improve airflow, though this practice should be discussed with your vet as it can also cause inflammation if done aggressively.

3. Pre-Existing Allergies

Dogs with atopic dermatitis often have chronically inflamed ear canals even when they are not actively infected. Adding water exposure to an already compromised ear canal dramatically increases infection risk. Allergic dogs who swim need even more vigilant post-swim ear care than healthy dogs.

4. Narrow or Stenotic Ear Canals

Some dogs have naturally narrow ear canals, and chronic infections can cause the canals to become permanently narrowed (stenotic). Narrow canals trap water more effectively and are harder to dry. Dogs with a history of recurrent ear infections may have stenotic canals that make swimming a particularly high-risk activity.

5. Frequency and Type of Water Exposure

Dogs that swim daily or multiple times per week face cumulative risk because their ears never fully dry and their protective wax layer is constantly being stripped. Natural water bodies (lakes, ponds, rivers) carry higher bacterial loads than chlorinated pools, making freshwater swimming more risky than pool swimming, though both can cause infections.

Which Breeds Are Most Affected?

While any dog can be affected, certain breeds are statistically more likely to experience the conditions discussed in this article. Genetics, coat type, ear shape, and skin fold anatomy all play a role in breed-specific predispositions. Understanding your dog's breed risk factors can help you take proactive steps.

• Labrador Retriever: Labs are one of the most popular breeds and commonly present with skin allergies, ear infections, and environmental sensitivities.
• Golden Retriever: Golden Retrievers are predisposed to atopic dermatitis, hot spots, and ear infections due to their dense double coat and floppy ears.
• German Shepherd: German Shepherds frequently develop perianal fistulas, food sensitivities, and environmental allergies that cause chronic itching.
• French Bulldog: Frenchies are especially prone to skin fold dermatitis, allergies, and ear infections due to their brachycephalic anatomy.
• Cocker Spaniel: Cocker Spaniels have a genetic predisposition to seborrhea, chronic ear infections, and allergic skin disease.

Signs and Symptoms

Ear infections from swimming typically develop within one to three days after water exposure. Recognizing the early signs allows you to seek treatment before the infection progresses from mild to severe. Watch for these symptoms in the days following any swimming activity.

Increased Head Shaking After Swimming

Some head shaking immediately after swimming is normal as the dog tries to remove water. However, if head shaking continues or increases the next day, it suggests water has remained trapped and irritation or early infection has begun. Persistent head shaking 24 hours after swimming is an early warning sign that should not be ignored.

Pawing or Scratching at the Ears

Dogs with early-stage post-swim infections often start pawing at the affected ear or rubbing it against furniture, carpeting, or the ground. This behavior indicates itching or discomfort in the canal. If your dog did not exhibit this behavior before the swim but starts within a day or two afterward, an infection is developing.

Redness and Swelling at the Ear Canal Opening

Looking at the underside of the ear flap and the visible opening of the ear canal, you may notice increased redness and slight swelling. Healthy ear tissue is pale pink. Tissue that appears angry red, swollen, or shiny indicates inflammation, which is the body's response to the growing infection.

Unusual Odor Coming from the Ears

An infected ear produces a distinctly unpleasant smell. Yeast infections often create a musty or corn-chip-like odor, while bacterial infections may smell sharper and more pungent. If your dog's ears smell different than usual after swimming, infection is likely already underway and a vet visit should be scheduled.

Discharge or Excessive Wax Buildup

Healthy ears may have a small amount of light-colored wax. Infected ears produce excess discharge that can be yellow, brown, green, or even bloody. If you see dark, thick, or discolored material when you look into or gently wipe your dog's ear after swimming, the infection has progressed and needs treatment.

Diagnosis

Getting an accurate diagnosis is the foundation of effective treatment. Many skin and ear conditions share overlapping symptoms, so a veterinary examination with appropriate diagnostic tests is essential before starting any treatment plan. Self-diagnosing at home can lead to wasted time, unnecessary expense, and prolonged discomfort for your dog.

Physical Examination

Your veterinarian will perform a thorough head-to-tail examination, checking the skin, coat, ears, and paws for signs of irritation, infection, or structural abnormalities.

Skin Scraping and Cytology

A skin scraping collects cells from the surface of the skin for microscopic examination. Cytology helps identify bacteria, yeast, mites, and inflammatory cells that point toward a specific diagnosis.

Allergy Testing

Intradermal skin testing or serum allergy panels can identify specific environmental or food allergens triggering your dog's symptoms. These tests help guide long-term management plans.

Ear Examination and Culture

An otoscopic exam allows the vet to visualize the ear canal and eardrum. If infection is suspected, a culture and sensitivity test identifies the specific organism and the most effective medication.

Treatment

If your dog develops an ear infection after swimming, prompt veterinary treatment prevents the infection from becoming chronic or spreading to the middle ear. Most post-swim ear infections respond well to treatment when caught early. Here is what to expect from the treatment process.

Veterinary Examination and Cytology

Your vet will examine the ear with an otoscope to assess the extent of infection and check the eardrum for damage. A cytology sample (ear swab examined under a microscope) identifies whether the infection is caused by bacteria, yeast, or both. This determines which medication will be most effective for your dog's specific infection.

Topical Ear Medication

Most post-swim ear infections are treated with prescription ear drops containing an antibiotic, antifungal, or both, combined with a corticosteroid to reduce inflammation. The drops are typically applied once or twice daily for 7 to 14 days. Completing the full course of treatment is essential to prevent relapse even if the ear looks better within a few days.

Professional Ear Cleaning

If there is significant debris or discharge in the canal, your vet may perform a thorough cleaning before starting medication. This ensures the medication contacts the infected tissue directly rather than sitting on top of a layer of debris. Heavily impacted ears may need a sedated flush for complete cleaning.

Oral Antibiotics for Severe Cases

If the infection has spread to the middle ear or involves a resistant organism, oral antibiotics may be necessary in addition to topical treatment. Culture and sensitivity testing helps your vet choose the most effective oral antibiotic. Severe post-swim infections, particularly those involving Pseudomonas, may require several weeks of systemic antibiotic treatment.

Restricting Water Access During Recovery

While the ear is being treated, keeping your dog out of the water is essential. Additional water exposure during treatment can wash out the medication, reintroduce bacteria, and prolong the infection. Most vets recommend avoiding swimming for at least one to two weeks after the infection has fully resolved and has been confirmed clear at a recheck.

Prevention

Prevention is far easier and less expensive than treating ear infections. A consistent post-swim ear care routine takes only a few minutes and can save your dog from weeks of discomfort and medication. These strategies are listed in order of importance.

Dry Ears Thoroughly After Every Swim

Immediately after your dog exits the water, gently lift each ear flap and wipe the inside surface and the visible canal opening with a soft, absorbent cloth or cotton ball. Then apply a veterinary ear drying solution (one that contains a drying agent like isopropyl alcohol in a safe formulation) to help evaporate residual moisture from deeper in the canal. This simple routine is the most effective prevention step.

Use a Veterinary Ear Drying Solution

Ear drying solutions designed for dogs contain ingredients that accelerate moisture evaporation and help maintain a healthy ear environment. These are different from ear cleaners and are formulated specifically for post-water use. Ask your vet to recommend a product and demonstrate how to apply it properly so you feel confident using it at home.

Establish a Weekly Ear Cleaning Routine

Dogs that swim regularly benefit from a weekly ear cleaning with a pH-balanced veterinary ear cleanser. This removes accumulated wax, debris, and early bacterial buildup before it can progress to infection. Cleaning day should be a positive experience, with treats and praise to keep your dog cooperative.

Consider Ear Protection for High-Risk Dogs

Snug-fitting canine ear bands or hoods are available that help keep water out of the ear canals during swimming. These are especially useful for dogs with floppy ears or a history of recurrent swim-related infections. While not all dogs tolerate ear coverings, those that do benefit significantly from the reduced water entry into the canals.

Know When to Skip the Swim

If your dog has an active ear infection, recently completed ear infection treatment, or has ears that look red or smell unusual, skip the swim that day. Allowing the ears to fully recover between infections is important for long-term ear health. One missed swim day is far better than another round of antibiotics and veterinary bills.

Schedule Pre-Summer Veterinary Ear Checks

Before swim season begins, have your vet examine your dog's ears to establish a healthy baseline. If there is any low-grade inflammation or early yeast overgrowth, treating it before the first swim prevents a minor issue from becoming a full-blown infection after water exposure. This proactive step is especially valuable for breeds predisposed to ear problems.

Related Symptoms

Dogs with this condition often show these symptoms. Our guides explain each one:

• Why Your Dog Keeps Licking Their Paws, Explore the common causes of obsessive paw licking, from allergies to yeast infections.
• Dog Ear Scratching and Head Shaking: Common Causes, Understand why your dog scratches their ears and when it signals an infection.
• Dog Hot Spots: Causes, Treatment, and Prevention, Learn how to identify and treat acute moist dermatitis in dogs.
• Dog Skin Redness and Inflammation: What It Means, A guide to understanding the common causes of red, inflamed skin in dogs.

Frequently Asked Questions About Dog Ear Infections After Swimming

Q: How soon after swimming can a dog develop an ear infection?

Most post-swim ear infections develop within 24 to 72 hours after water exposure. The trapped moisture creates conditions for rapid bacterial and yeast growth during this window. This is why post-swim ear drying is most effective when done immediately after the dog exits the water.

Q: Is pool water safer for dog ears than lake water?

Chlorinated pool water carries a lower bacterial load than natural water bodies, but it can still cause infections because the primary issue is moisture retention, not contamination. Pool chemicals can also irritate the ear canal lining. Dogs that swim in pools still need the same post-swim ear drying routine.

Q: Can I use rubbing alcohol to dry my dog's ears after swimming?

Do not use rubbing alcohol directly in your dog's ears. While alcohol evaporates quickly, it can severely irritate and dry out the delicate ear canal lining, causing pain and increasing vulnerability to infection. Use a veterinary ear drying solution that contains safe concentrations of drying agents balanced with soothing ingredients.

Q: Should I pluck the hair from my dog's ears to prevent swimming infections?

This is debatable among veterinarians. Removing ear hair can improve airflow and moisture evaporation, but aggressive plucking causes inflammation that can itself predispose to infection. Discuss this with your vet to determine whether hair removal is appropriate for your dog's specific ear anatomy and risk profile.

Q: My dog swims every day in summer. How can I prevent ear infections?

Daily swimmers need the most rigorous ear care routine. Dry ears thoroughly after every swim, use a veterinary ear drying solution each time, and perform a weekly deep cleaning with a veterinary ear cleanser. Consider ear protection bands and schedule monthly vet checks during swim season. If infections still occur, your vet may recommend limiting swim frequency.

Q: Can I let my dog swim if it just finished ear infection treatment?

Wait until your vet confirms the infection is fully resolved, typically at a recheck appointment with clean cytology results. Most vets recommend an additional one to two weeks of no swimming after clearance to allow the ear canal to fully recover its protective wax layer. Returning to water too soon is a common cause of immediate reinfection.

Sources

Miller, W.H., Griffin, C.E., & Campbell, K.L. (2013). Muller and Kirk's Small Animal Dermatology, 7th Edition. Elsevier.

Bajwa, J. (2019). Canine otitis externa: Treatment and complications. Canadian Veterinary Journal, 60(1), 97-99.

Olivry, T., et al. (2015). Treatment of canine atopic dermatitis: Updated guidelines from the International Committee on Allergic Diseases of Animals. BMC Veterinary Research, 11, 210.

Nuttall, T. (2019). Successful management of otitis externa. In Practice, 38(Suppl 2), 17-21.

Related Reading

• Dog Skin Allergies: The Complete Guide, A comprehensive overview of environmental, food, and contact allergies in dogs.
• Ear Infections in Dogs: Complete Guide, Everything you need to know about causes, treatment, and prevention of canine ear infections.
• Chlorhexidine for Dogs: The Complete Guide, Learn how chlorhexidine sprays and wipes provide proven antimicrobial protection.
• Dog Itchy Skin Relief: What Actually Works, Evidence-based approaches to relieving your dog's itchy skin.

Emiel 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.