The single most effective way to prevent ear infections in dogs after swimming is to dry and clean their ears every time they get out of the water. Moisture trapped in the ear canal raises humidity and shifts the pH balance, creating ideal conditions for bacteria and yeast to multiply. With a consistent post-swim routine and the right supplies, most water-related ear infections are entirely preventable.
Why Swimming Leads to Ear Infections
A dog’s ear canal is shaped like an L, bending downward and then inward toward the eardrum. That bend is great at protecting the eardrum, but it also traps water. When moisture sits in the canal, it increases wax production, raises local humidity, and changes the ear’s natural pH. All of those shifts give bacteria and yeast the warm, damp environment they need to overgrow, leading to otitis externa, the most common type of ear infection in dogs.
The type of water matters less than the fact that it’s there. Lake water, ocean water, and pool water can all trigger infections if they stay trapped in the canal. That said, lakes and ponds carry more environmental bacteria than a chlorinated pool, so the risk of a particularly stubborn infection can be higher after freshwater swimming.
Some Breeds Are at Much Higher Risk
Dogs with long, floppy ears are significantly more prone to ear infections because their ear flaps seal off airflow to the canal. Research from the Royal Veterinary College found that breeds with pendulous ears had about 1.8 times the risk of ear infection compared to breeds with erect, pointed ears. The top five most affected breeds were Basset Hounds, Chinese Shar Peis, Labradoodles, Beagles, and Golden Retrievers. Poodle and spaniel types were also at elevated risk overall.
If your dog falls into one of these categories, post-swim ear care isn’t optional. Even dogs with upright ears benefit from drying, but floppy-eared breeds need it every single time without exception.
The Post-Swim Ear Cleaning Routine
Cornell University’s veterinary program recommends a routine ear cleaning any time your dog’s ears get wet. Here’s what that looks like in practice:
- Dry first. Use a clean towel to gently blot the outer ear and the entrance to the canal. Let your dog shake. That head shake does real work, flinging water out of the deeper canal where your towel can’t reach.
- Apply a drying ear cleaner. Squeeze a veterinarian-approved ear cleaning solution into the canal, then massage the base of the ear for 20 to 30 seconds. You’ll hear a squishing sound. Let your dog shake again.
- Wipe away debris. Use cotton balls or cotton pads to gently clean the visible part of the canal. Go only as deep as your finger fits comfortably, roughly one knuckle in, and wipe from the inside outward.
- Never use cotton swabs. Q-tips can push debris and moisture deeper into the canal or damage the eardrum.
The entire process takes about two minutes per ear. Do it immediately after swimming, not hours later when you get home. The longer water sits in the canal, the more the environment shifts toward infection.
Choosing the Right Ear Cleaner
Look for a product specifically labeled as an ear drying solution for dogs. These typically contain drying agents like isopropyl alcohol or aluminum acetate, paired with mild acids such as boric acid or salicylic acid. The drying agents evaporate trapped moisture, while the acids help maintain the ear’s naturally low pH, which discourages bacterial and yeast growth. Some formulations also have mild antibacterial properties.
Your vet can recommend a specific product based on your dog’s ear health history. If your dog has had previous infections or has sensitive skin, the vet may steer you toward a gentler formula.
Skip the Home Remedies
You’ll find plenty of DIY recipes online calling for apple cider vinegar, rubbing alcohol, coconut oil, or castor oil. Hill’s Pet Nutrition advises against using any of these in your dog’s ears. Vinegar can sting irritated tissue. Straight rubbing alcohol can cause pain and dryness that damages the skin lining the canal. Oils can trap moisture rather than remove it, doing the opposite of what you need after swimming. Stick with a product formulated for canine ears.
Trim Excess Ear Hair
Dogs with heavy fur around the ear canal opening have an extra barrier to airflow. That fur acts like a wick, pulling water into the canal and holding it there. VCA Animal Hospitals recommends clipping or trimming the fur at the opening of the ear canal to improve air circulation. If you’re not comfortable doing this yourself, a groomer can handle it during regular appointments. For dogs who swim frequently, keeping this area trimmed throughout the summer makes a noticeable difference.
Swim Snoods and Ear Protection
For dogs with chronic ear problems or breeds that seem to get infections no matter how diligent you are with drying, swim snoods are worth considering. These are lightweight, water-resistant wraps that fit over your dog’s head and cover both ears. They use velcro fasteners to stay secure during swimming and prevent water from splashing into the ear canal. They’re designed for both floppy-eared and upright-eared breeds.
A snood isn’t a substitute for post-swim drying, since some moisture can still work its way in. But it reduces the volume of water entering the canal significantly, which is especially helpful for dogs in aquatic therapy or those who swim daily.
Signs an Infection Has Already Started
Even with good prevention, infections can still happen. Watch for these early signals in the days after swimming:
- Head shaking or tilting that persists well after the ears are dry
- Scratching at the ears or rubbing them against furniture or the floor
- Redness or swelling visible inside the ear flap
- Odor coming from the ear, often described as yeasty or sour
- Discharge that’s brown, yellow, or darker than normal wax
- Sensitivity to touch when you try to handle the ear
If you notice any of these within a few days of swimming, your dog likely needs treatment. Ear infections don’t resolve on their own, and delaying care allows the infection to move deeper into the canal, where it becomes harder to treat and more painful for your dog. Early infections are typically straightforward to clear up, while chronic or deep infections can require weeks of treatment.
Building a Sustainable Routine
The dogs most at risk for swimmer’s ear are the ones who swim often and love the water. That’s the good news and the bad news: you probably can’t keep them out of the lake, but you know exactly when prevention is needed. Keep a bottle of ear cleaner and a bag of cotton balls in your car, your beach bag, or wherever you store towels for post-swim dryoff. Making it part of the same routine as toweling off their coat means it becomes automatic rather than something you have to remember separately.
For frequent swimmers, a quick visual check of the ears every few days helps you catch early changes before they become full infections. Flip the ear flap, look for redness or unusual wax buildup, and give a sniff. Healthy ears have minimal odor. Any shift from your dog’s baseline is worth paying attention to.