The Connection Between Water and Ear Problems in Dogs
Dogs that love to swim, splash, or even simply bathe regularly are at significantly higher risk of developing ear infections than those with limited water exposure. The condition commonly referred to as swimmer's ear in dogs — known clinically as otitis externa — occurs when water becomes trapped in the ear canal, creating a warm, moist environment that is ideal for bacterial and yeast overgrowth.
While swimmer's ear can affect any dog, certain breeds are far more prone to it due to their anatomy. Understanding the underlying mechanisms, recognising the signs early, and knowing how to prevent and treat the condition can save your dog considerable discomfort and prevent a simple infection from progressing to something far more serious.
Why Dogs Are Particularly Susceptible
A dog's ear canal has a distinctive L-shaped structure — it runs vertically downward before turning horizontally toward the eardrum. This anatomy, while providing some protection from direct trauma, also makes drainage of water and debris much less efficient than in a human ear. Water that enters the canal during swimming or bathing can pool at the horizontal section, remaining trapped long after the dog has dried off.
Breeds at Higher Risk
Floppy-eared breeds face the greatest challenge because the ear flap (pinna) covers the canal opening, reducing air circulation and maintaining the warmth and humidity that pathogens thrive in. Breeds including Cocker Spaniels, Basset Hounds, Golden Retrievers, Labrador Retrievers, and Poodles are particularly commonly affected. Dogs with hairy ear canals — another characteristic common in Poodles and some terrier breeds — have an additional complicating factor, as hair can trap moisture and debris close to the canal surface.
Recognising the Symptoms
Swimmer's ear tends to develop within one to three days of water exposure, though dogs with chronic or recurrent infections may show signs more quickly. Catching the condition early gives the best prognosis and allows for straightforward treatment.
- Scratching at one or both ears, often persistently
- Head shaking or tilting the head to one side
- Redness or swelling visible at the entrance to the ear canal
- A dark brown, yellow, or black discharge from the ear
- An unpleasant smell coming from the ear
- Sensitivity or pain when the ear is touched
- Rubbing the ear against furniture, carpet, or the ground
- Reduced hearing or apparent confusion in response to sounds
In more advanced cases, you may notice the dog appearing lethargic or off their food, particularly if the infection has become painful. Severe or untreated otitis externa can progress to middle and inner ear involvement (otitis media and interna), which can cause neurological signs including loss of balance, abnormal eye movements, and significant pain. At this stage, surgical intervention may be required.
What to Do If You Suspect Swimmer's Ear
If your dog is showing signs of an ear infection, a veterinary assessment is the appropriate first step — not home treatment with cotton buds or over-the-counter products. A vet will examine the ear canal using an otoscope to assess the extent of the infection and check whether the eardrum is intact. This matters enormously because some ear treatments are contraindicated if the eardrum has been perforated; using the wrong product in this situation can cause permanent hearing damage.
The vet may take a swab for cytology — examining the discharge under a microscope — to determine whether bacteria, yeast, or a combination of both is responsible. This guides the choice of treatment. Bacterial infections typically respond to antibiotic ear drops, yeast infections to antifungal preparations, and mixed infections may require a combination product. Many veterinary ear treatments also contain a corticosteroid to reduce inflammation and relieve pain.
In some cases, the vet will perform an ear flush to remove accumulated debris before applying medication. This should only be done by a professional who has confirmed the eardrum is intact.
Prevention: Reducing the Risk After Water Exposure
For dogs that swim regularly, a proactive approach to ear care after each water session makes a significant difference in reducing infection frequency.
Drying the Ears Thoroughly
After swimming or bathing, gently dry the outer ear and the visible portion of the ear canal using a soft cotton ball or clean cloth. Avoid inserting anything deeply into the canal, and never use cotton buds, which can push debris further in and risk damaging the delicate canal tissue. Allowing the dog to shake their head after getting wet helps expel some of the water naturally.
Ear-Drying Solutions
Veterinary-formulated ear drying solutions — available from veterinary practices and some pet shops — can be applied after swimming to help acidify the ear canal environment and promote drying. These solutions typically contain ingredients such as acetic acid, boric acid, or salicylic acid, which make the canal less hospitable to pathogens. Ask your vet to recommend one suitable for your dog, particularly if they swim frequently.
Routine Ear Checks
Building a habit of briefly checking your dog's ears after every swim — looking for redness, discharge, or an unusual smell — allows you to identify problems in their earliest stages when they are most easily treated. Gently folding back the ear flap and looking at the visible canal surface takes only a few seconds and can catch a developing infection before it becomes entrenched.
Managing Chronic Otitis in Swimming Dogs
For dogs with recurrent ear infections despite preventative care, a more thorough investigation may be warranted. Chronic otitis externa is frequently secondary to an underlying cause such as environmental or food allergies, hormonal disorders like hypothyroidism, or anatomical abnormalities. Treating only the active infection without identifying the root cause leads to an ongoing cycle of reinfection.
A dermatology referral may be recommended for dogs with repeated infections, as allergic skin disease is among the most common drivers of chronic ear problems in dogs. Addressing the underlying allergy — through dietary trials, allergy testing, or medical management — often produces a dramatic reduction in ear infection frequency, even in breeds with anatomical predispositions.
Swimming need not be off-limits for infection-prone dogs, but it does require consistent management, owner vigilance, and a clear plan developed in partnership with a trusted veterinarian.