Dog Ear Infection: Signs, Home Care, and When to See the Vet

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-08-14

Key Takeaways

• Canine ear infections, primarily otitis externa, are commonly caused by bacterial or yeast overgrowth, often triggered by moisture or allergies, leading to inflammation, itching, and discharge.
• Emergency signs necessitating immediate veterinary attention include ataxia (inability to stand/walk normally), persistent vomiting, or neurological signs like rapid eye movements, which may indicate a severe inner ear or central nervous system involvement.
• Home care is limited to comfort and outer ear cleaning with vet-approved solutions; never insert cotton swabs or administer human medications (e.g., ibuprofen, acetaminophen) or unverified home remedies (vinegar, alcohol, peroxide) into the ear canal, as these can cause significant damage, including eardrum rupture and permanent hearing loss.
• A veterinary diagnosis is crucial as clinical signs overlap with conditions like ear mites, foreign bodies, or growths; otoscopic examination and cytology (microscopic analysis of discharge) are essential for accurate identification of the causative agent and appropriate treatment selection.
• Same-day veterinary appointments are indicated for signs of significant pain, swelling, heat, or purulent/bloody discharge, as prompt treatment is vital to prevent eardrum perforation and manage discomfort effectively.
• Recurrent ear infections often stem from underlying conditions such as allergies, hypothyroidism, or anatomical abnormalities, requiring comprehensive diagnostic workup and long-term management strategies beyond symptomatic treatment.

If your dog is shaking their head, scratching at an ear, or tilting their head to one side, an ear infection is a likely cause. These signs are uncomfortable for your dog, but most ear infections are not emergencies. However, a few signs do mean you should stop reading and go to an emergency vet right now: a dog who cannot stand or walk normally, who is vomiting repeatedly, or who has a bulging, red, or painful eye along with ear signs. Those can point to a deeper problem like a severe inner ear infection or a neurological issue. For everything else, read on to learn what you can do at home, what you should not do, and when a vet visit is truly necessary.

Ear infections in dogs are common and treatable. The tricky part is that the signs overlap with other problems, including ear mites, foreign objects like grass seeds, allergies, and growths. You cannot tell which one your dog has without a proper look inside the ear canal. That is why home care has strict limits. You can keep your dog comfortable, but you should not try to cure the infection yourself.

Is This an Emergency?

Use this table to decide your next step. When in doubt, call a veterinary clinic and describe what you see. A quick phone call is free and can save you worry.

{
 "type": "triage",
 "title": "Urgency triage by severity of signs",
 "tiers": [
  {
   "tier": "danger",
   "label": "Go to an emergency vet now",
   "signs": [
    "Cannot stand or walk without falling, head tilted so far the nose points at the floor, vomiting more than once, eyes darting side to side rapidly, a red, swollen, or cloudy eye, seizures, collapse, or you see blood or thick pus pouring from the ear"
   ],
   "action": [
    "Do not wait for a regular appointment",
    "These signs can mean the infection has spread to the inner ear or brain",
    "Drive to the nearest open emergency clinic"
   ]
  },
  {
   "tier": "warn",
   "label": "Book a same-day appointment",
   "signs": [
    "Ear is hot, swollen, or painful to touch, you see yellow, green, brown, or bloody discharge, a strong bad smell from the ear, your dog yelps or pulls away when you gently touch the ear base, head shaking that does not stop for more than a few minutes"
   ],
   "action": [
    "Call your regular vet this morning",
    "Ear pain is miserable, and a swollen ear canal is harder to treat the longer it sits",
    "Same-day care will also prevent the eardrum from bursting"
   ]
  },
  {
   "tier": "safe",
   "label": "Watch at home for 24 to 48 hours",
   "signs": [
    "Mild head shaking once or twice an hour, occasional scratching, no discharge, no smell, no pain when touched, ears look clean and pink on the outside, your dog eats, drinks, and acts normally"
   ],
   "action": [
    "Clean the outer ear gently with a vet-approved ear cleaner if you have one",
    "Do not put anything else in the ear",
    "If signs get worse or do not improve in two days, book a vet visit"
   ]
  }
 ]
}

What Is Most Likely Going On

An ear infection is inflammation of the ear canal, the tube that runs from the outer ear flap down to the eardrum. Most infections start in the outer part of that tube, a condition called otitis externa. The canal becomes red, swollen, and itchy. It produces extra wax and discharge, which is why you may notice a smell or see dark gunk.

The most common causes are bacteria and yeast. Both live naturally in small numbers in a healthy ear. When something changes the environment, they multiply out of control. Moisture is a classic trigger. Dogs who swim, who have floppy ears that trap humidity, or who get water in their ears during baths are prone to this. Allergies are another major cause. Food allergies and environmental allergies like pollen can make the ear lining inflamed, which then allows bacteria or yeast to take over. The American Veterinary Medical Association's pet owner resources explain that routine preventive care and knowing your dog's normal behavior help you catch problems like these early.

What Else It Could Be

Ear mites are a common alternative, especially in puppies. These tiny parasites cause intense itching and a dark, crumbly discharge that looks like coffee grounds. Unlike a bacterial infection, ear mites are contagious to other pets. A foreign object is another possibility. Grass seeds, foxtails, or small pieces of plant material can get lodged in the ear canal and cause sudden, violent head shaking. A growth or polyp in the ear can also cause similar signs, particularly in older dogs. The MSD Veterinary Manual for pet owners notes that a thorough ear examination is needed to tell these conditions apart because their signs overlap so closely.

Why Home Remedies Can Make Things Worse

You may have seen advice to use vinegar, alcohol, hydrogen peroxide, or tea tree oil in a dog's ear. Do not do this. These substances sting damaged skin and can make the inflammation worse. Alcohol and hydrogen peroxide can also damage the delicate tissue inside the ear canal. If your dog's eardrum has already ruptured, which you cannot see from the outside, any liquid you pour in can reach the middle ear and cause severe pain, balance problems, and permanent hearing loss. The same risk applies to cotton swabs. Never push a swab into the ear canal. You can pack debris deeper and push it against the eardrum.

What You Can Safely Do at Home

You can clean the outer part of the ear, meaning the ear flap and the visible opening of the canal. Use only a commercial ear cleaner made for dogs. Soak a cotton ball or soft cloth with the cleaner and wipe the visible surfaces. Do not squirt liquid deep into the ear unless your vet has shown you how and confirmed the eardrum is intact. You can also keep your dog from scratching by using an Elizabethan collar, often called a cone, especially at night. This prevents trauma to the ear flap. Keep the ear dry. If your dog swims, dry the outer ear gently with a towel afterward.

When a Vet Visit Is the Only Safe Option

Any infection that produces discharge, smell, or pain needs a vet. The vet will look inside the ear with an otoscope, a tool with a light and a magnifying lens. This shows whether the eardrum is intact and how far the infection extends. They may take a swab of the discharge and look at it under a microscope to identify the exact bacteria or yeast. That test determines which medication will actually work. Ear infections can be caused by resistant bacteria, and using the wrong treatment can make the infection worse. The FDA's veterinary telemedicine information explains that a veterinarian must have an established relationship with you and your dog before they can prescribe medication. That relationship usually requires an in-person exam first. A vet can then prescribe ear drops or oral medication, and the dose must come from that veterinarian based on your dog's weight and the severity of the infection. Never give your dog leftover antibiotics or human ear drops. The wrong drug can hide the infection while it continues to damage the ear underneath.

What to Write Down Before You Call the Vet

Before you pick up the phone or book an appointment, gather a few facts. This saves time and helps the vet give you better advice. You do not need to be a detective, just a careful observer.

Write down the answers to these questions:

• When did the signs start? Was it yesterday or three weeks ago?
• Is the ear discharge clear, brown, black, yellow, or bloody?
• Does the ear have a smell? Describe it as sweet, yeasty, or rotten.
• How many times in the last hour has your dog shaken their head or scratched at the ear?
• Has your dog tilted their head to one side, or seemed dizzy or off balance?
• Have you cleaned the ear or put anything in it already? If yes, what and when?
• Has your dog had ear problems before? If so, how were they treated?
• Does your dog swim often or have long, floppy ears?

If your dog will let you, gently lift the ear flap and look inside. Do not push anything into the canal. Note the color of the skin. Pink is normal. Bright red, swollen, or crusty skin is not. Take a photo with your phone if you can. Vets often find photos helpful.

A Symptom Checklist You Can Use

Print this or keep it on your phone. Use it to decide how urgent the situation is.

If your dog has any sign in the emergency row, stop reading and go to an emergency clinic now. Do not wait for a phone call or a video chat.

What Not to Do at Home

Some common habits cause real harm. Avoid all of these.

• Do not put cotton swabs or Q-tips into the ear canal. You will push debris deeper and can rupture the eardrum.
• Do not pour alcohol, hydrogen peroxide, or vinegar into the ear. These sting badly and can damage inflamed tissue.
• Do not use any human ear drops. Human medications are not formulated for dog ears and some contain ingredients that are toxic to dogs.
• Do not give your dog any painkiller meant for people. Ibuprofen, acetaminophen, and naproxen can be fatal to dogs.
• Do not clean the ear if you see blood, pus, or if your dog cries when you touch the ear. You may be dealing with a ruptured eardrum, and cleaning can make it worse.
• Do not wait more than two days if signs are getting worse. Ear infections do not resolve on their own.

What a Vet Visit Usually Involves

A vet will start by asking the questions you already wrote down. Then they will examine your dog from nose to tail, also the ears. They will look at both ears, even if only one seems bothersome.

The vet will use an otoscope, a tool with a light and a magnifying lens, to look down the ear canal. This checks for foreign objects, polyps, and the condition of the eardrum. If the canal is too swollen or painful, your dog may need sedation for this step.

The vet will likely take a swab of the ear discharge and look at it under a microscope. This test, called cytology, shows whether the problem is yeast, bacteria, or both. It takes a few minutes and guides the choice of medication. In some cases, the vet may send a swab to a lab for a culture to identify the exact bacteria and the antibiotics that will kill it.

Treatment usually involves cleaning the ear in the clinic and sending you home with medicated ear drops or ointment. Some infections need oral medication as well. The vet will show you how to apply the drops and how often to clean the ear at home.

The cost depends on what is needed. A simple visit with cytology might fall in the range of $100 to $300. A complicated case with sedation, culture, and oral medications can run higher. Prices vary widely by region and clinic, so ask for an estimate before treatment begins.

When an Online Vet Can Help, and When It Cannot

Any situation in this article that involves a suspected ruptured eardrum, a dog that cannot stand, or an ear so painful the dog will not let you near it requires hands-on care. Do not handle those remotely. The same applies if your dog has a fever, is vomiting, or has stopped eating. Those signs point to problems beyond the ear.

A remote consultation is genuinely useful for early or mild signs. If your dog is shaking their head a little but the ear looks clean and pink, an online vet can help you decide whether to watch and wait or book an appointment. If your dog is on treatment for a known ear infection and you have a question about how to apply the drops, or whether a bit of redness is normal, that is a good use of remote care. The American Veterinary Medical Association explains that telehealth can support the veterinarian-client-patient relationship when a proper relationship already exists. The FDA notes that prescribing rules vary by state, and a veterinarian may require an in-person examination before prescribing medication.

A remote vet can take a thorough history, watch your dog shake their head on video, and look at the outside of the ear. They cannot take a temperature, look down the ear canal, see the eardrum, or run cytology. They cannot feel whether the ear is painful deep inside. For those steps, your dog needs to be seen in person. If a remote vet advises a visit, take that advice seriously.

Common Mistakes Owners Make With Ear Infections

Many well-meaning owners delay care or try treatments that make the infection worse. Here is what to avoid and what to do instead.

How to Reduce the Chance of It Happening Again

Prevention starts with knowing why your dog got the infection in the first place. Dogs with floppy ears, narrow ear canals, or allergies get infections more often. Dogs that swim frequently trap moisture in the canal.

Dry your dog's ears after swimming or bathing. Use a soft towel on the outer ear only. Do not insert anything into the canal. If your dog has a history of infections, ask your vet about a maintenance cleaner designed for your dog's specific ear type.

Control allergies if they are the trigger. Food allergies, pollen, and dust mites can cause inflammation inside the ear that invites infection. Your vet can help you identify triggers and manage them. Regular grooming around the ear opening can improve airflow. Check your dog's ears weekly for redness, odor, or discharge, especially after outdoor time.

What Recovery and Ongoing Management Usually Look Like

Most uncomplicated ear infections improve within 7 to 14 days of proper treatment. Your vet will likely prescribe medicated ear drops or an oral medication. You may need to clean the ears at home during treatment. Your vet will show you exactly how.

You should see less head shaking and scratching within 48 to 72 hours. The redness and swelling usually fade over the first week. If your dog does not improve within a few days, call your vet. The infection may be resistant to the first medication, or something else may be going on.

Chronic cases need longer care. Dogs with allergies or anatomical issues may need repeat treatments, dietary changes, or regular cleaning schedules. Some dogs need a follow-up exam to confirm the infection is gone, even when the ear looks normal. This matters because stopping too early can lead to a resistant infection.

Frequently Asked Questions

Can I use olive oil or coconut oil in my dog's ear?

No. Oils coat the ear canal and can trap moisture, debris, and bacteria. They do not treat infection and can make the problem worse. Some oils can also irritate already inflamed tissue. If your dog has a ruptured eardrum, which you cannot see without an otoscope, putting oil in the ear can cause pain or damage deeper structures. Stick to products your veterinarian recommends for your dog's specific condition.

My dog keeps shaking his head but there is no smell. Is it still an infection?

Head shaking without odor can still be an ear infection, especially in the early stages. It can also be caused by ear mites, a foreign object like a grass seed, allergies, or a growth in the canal. These causes look similar from the outside. A veterinarian needs to examine the ear canal with an otoscope to tell them apart. Do not assume the absence of smell means there is no problem.

How long can I wait before seeing a vet?

Do not wait more than 24 hours if your dog is shaking their head, scratching at their ears, or showing pain. Ear infections progress quickly. A mild infection can become a deep infection or a ruptured eardrum within days. If your dog tilts their head, cannot stand, or seems dizzy, go to an emergency vet immediately. These signs can indicate a serious inner ear problem.

Will the vet need to sedate my dog for an ear exam?

Sometimes, but not always. Many dogs tolerate an ear exam with gentle restraint. If your dog is in significant pain, or if the canal is too swollen or painful to examine safely, sedation may be necessary. This allows the vet to see the eardrum clearly and take samples without causing distress. Sedation is routine and low risk for most healthy dogs.

Can I get a prescription online without an in-person visit?

In the United States, a veterinarian must have an established relationship with your dog before prescribing medication. This usually means an in-person exam. Telemedicine can be useful for follow-up care or for advice on whether to come in, but it cannot replace the physical exam needed to diagnose an ear infection safely. The American Veterinary Medical Association explains what remote care can legally cover. Your vet can tell you if a video visit is enough for your situation.

My dog's ear infection keeps coming back. What can I do differently?

Recurrent infections usually have an underlying cause that needs treatment, also the infection itself. Common causes include allergies, hypothyroidism, ear polyps, or a narrow ear canal. Ask your vet about allergy testing, dietary trials, or imaging of the ear canal. A culture of the ear discharge can identify resistant bacteria. Managing the root cause is the only way to break the cycle.

Related Clinical & Scientific Guides

• Dog Heatstroke: Emergency Cooling Steps and When to Rush
• Dog Vomiting: When to Call the Vet and What to Do at Home
• How to Make a Dog Vomit Safely at Home: When and How

References and Further Reading

• AVMA Telehealth and Veterinary Telemedicine
• FDA Veterinary Telemedicine Information
• AVMA Pet Owner Resources
• MSD Veterinary Manual Pet Owner Version
• AAHA Pet Owner Resources

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This article is general educational information for pet owners. It is not a substitute for veterinary diagnosis, examination, or treatment. If your pet is showing severe or rapidly worsening signs, contact an emergency veterinary hospital immediately.