Dog Ear Infection Symptoms: What to Look For and When to Act

If you’ve noticed your dog shaking their head more than usual or pawing at their ears, you’re right to pay attention. Ear infections are one of the most common health issues dogs face, and catching them early can make a real difference in how quickly your pup feels better. Understanding what to look for puts you in the best position to help your dog get the care they need.

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Common Causes

Ear infections in dogs don’t usually appear out of nowhere. In most cases, there’s an underlying reason why bacteria, yeast, or other irritants have taken hold in your dog’s ear canal. Knowing what’s behind the infection can also help prevent it from coming back.

Some of the most common culprits include:

• Moisture trapped in the ear canal — Dogs who love to swim or get frequent baths are especially prone to ear infections, since warm, damp environments are ideal for yeast and bacteria to thrive.
• Allergies — Both environmental allergies (like pollen or dust mites) and food allergies can cause inflammation in the ear canal, making it easier for infections to develop.
• Ear mites — These tiny parasites are particularly common in puppies and can cause intense itching and irritation that mimics or leads to a secondary infection.
• Excess wax or debris buildup — Some dogs naturally produce more ear wax than others, which can create a breeding ground for infection if the ears aren’t cleaned regularly.
• Anatomy — Dogs with floppy ears, such as Basset Hounds, Cocker Spaniels, and Labrador Retrievers, have less airflow in the ear canal, which increases their risk significantly.

Diagnosing the root cause typically involves your veterinarian performing an otoscopic exam — a close look inside the ear canal using a lighted instrument — along with a cytology test, where a small sample of discharge is examined under a microscope. This tells the vet whether bacteria, yeast, or a combination of both is driving the infection, which directly determines what type of treatment will be most effective. Skipping this step and treating blindly is one of the main reasons ear infections linger or keep coming back.

Allergies in particular are worth discussing in more depth, because they are the leading underlying cause of chronic and recurring ear infections. When a dog has environmental or food allergies, the immune system creates ongoing inflammation throughout the body — and the ear canal is one of the first places that inflammation shows up. Dogs with allergy-driven ear infections often see flare-ups in spring and fall when pollen counts are high, or year-round if a food ingredient is to blame. If your dog seems to get ear infections repeatedly, your vet may recommend an elimination diet or allergy testing to identify the trigger.

Age also plays a role. Puppies are more vulnerable to ear mites and tend to have less-established immune defenses, while older dogs may develop ear infections secondary to hormonal conditions like hypothyroidism or Cushing’s disease. These endocrine disorders change the skin’s environment in ways that make bacterial and yeast overgrowth more likely. If your senior dog suddenly starts getting ear infections without an obvious explanation, bloodwork to check thyroid and adrenal function is often a smart next step.

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Symptoms to Watch For

One of the challenges with ear infections is that dogs can’t tell you their ear hurts. Instead, they communicate discomfort through behavior and physical signs that are easy to miss if you’re not sure what you’re looking for. The good news is that once you know the signs, they’re usually pretty noticeable.

Here are the most common dog ear infection symptoms to watch for:

• Head shaking or tilting — Frequent, repetitive head shaking is often one of the first signs something is bothering your dog’s ear.
• Scratching at the ear or side of the face — Your dog may use their paw or rub their head against furniture or the floor to try to relieve the discomfort.
• Redness or swelling inside the ear — When you look inside the ear flap, you may notice the skin looks inflamed, irritated, or darker than usual.
• Unusual discharge — A brown, yellow, or black discharge coming from the ear canal is a strong indicator of infection. Healthy ears should look clean and light pink.
• Unpleasant odor — A yeasty, musty, or foul smell coming from your dog’s ear is one of the most telling signs of an active infection.
• Sensitivity or pain when the ear is touched — If your normally affectionate dog flinches or pulls away when you touch their ear, that’s a clear sign of discomfort.
• Loss of balance or coordination — In more serious or deep-seated infections, you may notice your dog seems unsteady on their feet or walks in circles, which can indicate the infection has reached the middle or inner ear.

It’s worth noting that symptoms can vary depending on whether the infection is caused by yeast, bacteria, or a combination of both. Either way, these signs should always be taken seriously.

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Symptom Severity at a Glance

Use this table as a quick reference when you’re trying to decide how urgently your dog needs to be seen. When in doubt, always err on the side of calling your vet.

Symptom	Risk Level	Action Required
Occasional head shaking, no other signs	Mild	Monitor at home for 24 hours
Mild redness or wax buildup inside the ear	Mild	Clean gently; schedule a routine vet visit
Visible discharge (brown, yellow, or black)	Moderate	Call your vet within 24 hours
Strong odor combined with scratching	Moderate	Schedule a vet appointment promptly
Significant swelling or the ear feels warm to the touch	Moderate	Call your vet same day
Yelping or aggression when ear is touched	Serious	Seek veterinary care as soon as possible
Loss of balance, walking in circles, or head tilt	Serious	Seek emergency veterinary care immediately

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Breeds Most at Risk

While any dog can develop an ear infection, certain breeds face a meaningfully higher risk due to their anatomy or coat characteristics.

Cocker Spaniels are one of the most commonly affected breeds. Their long, heavy ear flaps create a warm, low-airflow environment that bacteria and yeast thrive in. Cocker Spaniels are also genetically prone to seborrhea, a skin condition that increases wax and oil production inside the ear canal, compounding the problem significantly.

Basset Hounds share a similar anatomical disadvantage — dramatically drooping ears that sit close to the ground, limiting ventilation and trapping moisture after walks in wet grass or rainy weather. Their long ear canals also make thorough cleaning more challenging, which means debris builds up more easily between vet visits.

Labrador Retrievers and Golden Retrievers round out the high-risk group, largely because of their love of water. Frequent swimming drives moisture deep into the ear canal, and both breeds also have a higher incidence of environmental allergies — a double risk factor that makes routine ear maintenance especially important for these dogs.

If you own one of these breeds, talk to your vet about a proactive ear care routine before an infection develops. Prevention is far easier than treatment.

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What You Can Do at Home

While it’s important to get a proper diagnosis from your veterinarian, there are a few things you can do at home to keep your dog comfortable and prevent the situation from worsening.

Gently clean the outer ear. If you can see visible debris or discharge on the outer part of the ear flap, you can carefully wipe it away using a cotton ball or soft gauze. Avoid inserting anything deep into the ear canal, as this can push debris further in or cause injury.

Use a vet-approved ear cleaner. If your dog is prone to ear infections, your vet may have already recommended a routine ear cleaning solution. Follow the instructions carefully and only use products specifically designed for dogs.

Keep the ears dry. After baths or swimming, gently dry your dog’s ears with a soft towel. For dogs who swim frequently, ask your vet about preventive ear drying solutions.

Avoid home remedies. It can be tempting to try apple cider vinegar, hydrogen peroxide, or other DIY treatments you may find online. However, these can actually irritate the sensitive tissue inside the ear and make things worse. Stick to vet-approved products and guidance.

Most importantly, don’t delay getting professional help. Home care can provide temporary relief, but it won’t resolve an active infection on its own.

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When to See a Vet

If you notice any of the symptoms described above, scheduling a vet appointment sooner rather than later is always the right call. Ear infections rarely resolve on their own, and without proper treatment, they can progress quickly and become significantly more painful for your dog.

You should contact your vet promptly if:

• Symptoms have lasted more than a day or two without improvement
• There is significant discharge, odor, or swelling
• Your dog seems to be in pain or is unusually irritable
• Your dog has lost their balance or is walking in circles
• The ear infection keeps coming back

Recurring ear infections in particular deserve a thorough investigation, as they often signal an underlying issue like allergies or a hormonal condition that needs to be addressed directly. Your vet may recommend skin testing, dietary changes, or additional diagnostics to get to the root of the problem.

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How Pet Insurance Can Help

Ear infections can range from a straightforward office visit to a more involved and costly treatment plan, especially if allergies or chronic infections are involved. Having pet insurance in place means you won’t have to think twice about getting your dog the care they need when symptoms arise.

Protective Care: Get a free pet insurance quote and protect your dog today

For times when you need immediate guidance from a licensed veterinarian without leaving home, telehealth services can be a lifesaver.

For more clinical details on canine health, you can refer to the professional guidelines from the Merck Veterinary Manual.

Immediate Support: Top-Rated Pet First Aid Kit — Check Price & Availability on Amazon

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Your dog depends on you to notice when something isn’t right, and the fact that you’re looking into this already says a lot about the kind of pet parent you are. With the right information and a good relationship with your veterinarian, ear infections are very manageable — and many dogs go on to live completely comfortable, healthy lives with the right care and prevention plan in place. Trust your instincts, act early, and never hesitate to reach out to a professional when your pup needs support.