Canine ear health is a crucial part of daily pet care. When faced with the question of “ear mites vs. ear infection in dogs,” how can pet owners tell the difference? Do you use search engines to compare symptoms and find answers?
One day, my friend’s dog suddenly started scratching its ears. I asked her to send me a photo of the dog’s ears, and after a preliminary assessment, I thought the dog had an ear infection. The veterinarian’s diagnosis later confirmed that it was indeed an infection.
To help more pet owners distinguish between ear mites and ear infections, this article will provide a professional veterinary perspective to help you quickly and safely identify and differentiate between the two based on their symptoms.
Ear mites (scientific name Otodectes cynotis), also known as ear scabies or itch mites, are a common parasite found in a dog’s outer ear canal. Although they primarily infest the ear canal, in rare cases they can spread to a dog’s head, neck, and tail.
Ear mites are microscopic parasites that are nearly invisible to the naked eye and can occur year-round. They thrive in warm, moist, and dark environments, irritating the skin of a dog’s ear canal and feeding on earwax, skin flakes, and tissue fluids.
All four life stages of ear mites—eggs, larvae, nymphs, and adults—are completed within a dog’s external ear canal. They lay their eggs in the ear canal and on the surrounding fur, which is the primary cause of severe itching in the ear canal and frequent head shaking in dogs.
Dogs infected with ear mites usually show obvious signs. Please pay close attention to the following:
If you notice ear mites in your dog’s ears, please do not attempt to clean deep inside the ear canal with a cotton swab on your own—this is extremely dangerous. A dog’s ear canal is L-shaped. If you attempt to clean it without proper guidance, you may not only push the ear mites and debris deeper into the canal and pack them tighter, but you also risk puncturing your dog’s delicate eardrum. The correct approach is to take your dog directly to a veterinarian or use a professional pet ear-cleaning solution to clean its ears.
Cross-infection between cats and dogs: Ear mites spread very quickly between cats and dogs. If you have both cats and dogs—or other small animals—in your home, and one of your pets becomes infected, please isolate the affected pet from the others. Do not take any chances. The life cycle of ear mites is approximately 18–28 days. Without isolation, you’re likely to get stuck in a vicious cycle where one pet recovers only for another to become infected.
Risk of Transmission to Humans: Ear mites are not a zoonotic disease. I know some pet owners worry about catching ear mites from their pets, but the risk to humans is actually very low. Furthermore, humans are not ideal hosts for ear mites, so the risk of transmission is extremely low. However, if your pet has ear mites, I still recommend avoiding close contact with it. Ear mites may cause a temporary rash or mild itching on human skin, which usually resolves on its own. Therefore, until your dog has fully recovered, I suggest that you and your family temporarily avoid sharing a bed with it or engaging in overly intimate face-to-face contact.
Currently, the fastest curative treatments available on the market primarily involve modern oral or topical antiparasitic medications, such as NexGard Spectra, Bravecto, or NexGard. The active ingredients in these medications rapidly spread throughout the body via the bloodstream and tissue fluids. When ear mites ingest even trace amounts of tissue fluid containing these ingredients, they experience neurological paralysis and die in large numbers within a short period of time.
(This article does not accept payment for products mentioned. Brand names appear only when relevant to standard veterinary practice.)
According to the latest clinical guidelines from the CAPC (Companion Animal Parasite Council), clinical trials have shown that isoxazoline-based medications achieve a single-dose clearance rate of over 99% for ear mites in dogs. Veterinarians now rarely recommend a single, cumbersome daily topical ear treatment; instead, they prefer this comprehensive preventive regimen that addresses heartworms, fleas, ticks, and ear mites.
However, please note: Although the medication quickly kills ear mites, the dead mites, eggs, and “coffee-ground”-like earwax accumulated in the ear canal will not disappear on their own. At the start of treatment, it is recommended that you use a mild, veterinarian-prescribed dog ear cleaner in conjunction with the treatment, gently massaging the base of the ear to encourage your dog to shake out the debris on its own. This can greatly alleviate the local allergic reactions and severe itching caused by the decomposition of dead mites.
Yes, you can certainly treat your dog’s ear mites at home. You’ll need to have an Elizabethan collar, a flashlight, small treats, clean cotton balls, pet-safe ear cleaning solution, and ear mite ointment or ear drops on hand. Then, follow these steps:
1. Put the Elizabethan collar on your dog and have some small treats ready to calm your dog or use as a reward.
2. Gently pull back your dog’s ear flap and use a flashlight to examine the ear canal. Squeeze the ear cleaning solution deep into the ear canal (3–5 drops, depending on the size of the ear canal).
3. Close the ear flap and gently massage the base of the dog’s ear for 10–30 seconds until you hear the ear cleaning solution dissolving the earwax.
4. Release your hand and let the dog shake its head naturally to expel any debris and liquid from the ear canal.
5. Gently wipe away any dirt from the dog’s outer ear canal with a cotton ball.
6. Once you’ve confirmed the ear canal is clean, apply ear mite ointment or ear drops into the canal, then massage for another 10 seconds to promote absorption.
Please do not blindly trust so-called “natural remedies” currently circulating on the market, such as “smothering ear mites with olive oil” or “cleaning the ears with diluted apple cider vinegar.” These methods can easily lead to secondary bacterial infections and may even damage your dog’s eardrum. If you are unsure how to proceed, please consult your veterinarian for professional advice.
The treatment period for ear mites in dogs is typically between two weeks and one month, though the dog’s overall health and immune system must also be taken into account. Since ear mites have a relatively long life cycle (18–28 days), please do not stop treatment prematurely. Incomplete treatment carries a risk of recurrence, which is distressing for both you and your dog. I once saw a post on a pet forum where a pet owner mentioned that their dog had been treated for ear mites several times but kept having recurring outbreaks. People in the comments told them the treatment period was too short; after extending the treatment, the dog’s condition indeed improved significantly.
Now that we’ve covered ear mites, let’s talk about ear infections—clinically known as otitis externa. When pet owners notice a problem with their dog’s ears, their first thought is often ear mites, but infections are also a major issue affecting dogs’ ears. Ear infections in dogs are primarily caused by the invasion of yeast and bacteria. A dog’s ear is an ideal environment for the growth and reproduction of these microorganisms—it serves as a natural breeding ground for bacteria and fungi, making ear infections highly likely.
The initial symptoms of an ear infection in dogs are similar to those of ear mites; both conditions involve frequent ear scratching and head shaking. However, upon closer observation, you’ll notice several key differences between an ear infection and ear mites:
A reminder: If you notice that your dog’s ears are red and swollen, the dog is lethargic, and it resists being touched, do not attempt to treat the condition yourself, and do not use human medications. You should immediately consult a veterinarian or take your dog to a clinic for an examination, followed by appropriate treatment.
There are many reasons why dogs develop ear infections, but the following are the main ones to watch out for:
1. Although ear mites are parasites, they cause intense itching, leading dogs to scratch frantically. The skin inside a dog’s ear canal is very delicate; once the skin barrier is broken, fungi and bacteria trapped under the dog’s nails can take advantage of the opening, leading to a secondary infection.
2. A dog’s ear canal has a distinctive L-shape, a structure that makes it very difficult for air to circulate inside. Many breeds with floppy ears have large ears that hang down, completely covering the ear canal. This warm, moist, and dark environment is ideal for bacteria and fungi to survive and multiply. Once these microorganisms overgrow, the dog’s ears will immediately become inflamed.
3. Allergies are a hidden trigger that many pet owners tend to overlook. Food, pet supplies, and even environmental factors such as dust and pollen can cause a dog’s skin immune barrier to break down, allowing bacteria to invade and cause infection.
4. Water left in the ears that isn’t thoroughly dried off is the most common cause in summer. Many pet owners fail to dry their dog’s ears promptly after a bath or a swim, leading to water accumulation. Stagnant water left in the ear canal for several days can cause infection and inflammation.
5. If a dog rolls around in the grass and isn’t cleaned off promptly upon returning home, foreign objects such as grass seeds, small insects, and tiny debris can enter the ear, chafing the dog’s ear and causing an infection.
First, you should understand that home treatment is only a supplementary measure; it cannot replace a veterinarian’s diagnosis. Improper handling and the indiscriminate use of medications may actually worsen your dog’s discomfort. If you notice a problem, please take your dog to a veterinarian for an in-person examination so the vet can identify the specific type of bacteria causing the infection. Once you have received a targeted prescription from the veterinarian, that’s when you can step in:
Before applying the medication, you must first clean the debris from your dog’s outer ear canal using a pet-specific ear-cleaning solution. However, never use cotton swabs to poke around inside the ear, as this can damage your dog’s ear canal. After cleaning, apply the medication exactly as prescribed by your veterinarian. Even if your dog resists, you must complete this step, as it is the most critical part of the treatment. Finally, you must strictly follow the full course of treatment. Do not stop applying the drops just because your dog’s ears are no longer red; to prevent recurrence, you must eliminate any remaining bacteria deep within the ear canal and prevent them from developing drug resistance.
A tip for dog owners: Since the medication is quite cold, you can warm it up in the palm of your hand before use to reduce your dog’s discomfort.
Except in cases of minor infections, the vast majority of ear infections in dogs will not heal on their own. Please do not use human medication.
Why shouldn’t you wait for the infection to heal on its own? Regardless of the severity, a dog’s ear infection requires a professional evaluation by a veterinarian to check for damage to the eardrum. If you take a chance and delay seeing a veterinarian, it could very likely lead to more serious problems.
Why shouldn’t you use human medications? Please do not administer human medications to your dog on your own. According to VCA Animal Hospitals, using medications without veterinary guidance can lead to serious side effects or even organ damage.
If you’d like to monitor your dog’s condition at home for a while, that’s fine, but if any of the following symptoms occur, don’t wait—take your dog to see your veterinarian immediately!
• Yellowish-green pus draining from the ears
• The dog’s ears are visibly swollen
• The dog resists being touched and displays aggression
• The dog constantly tilts its head to one side (this is a sign of neurological damage and requires immediate attention)
Veterinarians use specialized examination equipment and procedures. Generally, the examination consists of three steps:
Otoscopic examination: The veterinarian will insert an otoscope into the dog’s ear canal (don’t worry—as long as the dog stays still, this won’t cause any pain) to clearly view the deepest part of the L-shaped ear canal. They’ll check whether the eardrum is intact and look for any grass seeds, ticks, or tumors hidden inside.
Ear swab sampling: The veterinarian will use a long, thin cotton swab to gently collect a sample of secretions from the dog’s ear canal.
Microscopic cytology examination: The veterinarian will smear the collected secretions onto a glass slide, stain the sample, and examine it under a microscope. Under the microscope, if you see clusters of “small yeast-like cells” (Malassezia) shaped like the Chinese character “八” or a gourd, it indicates a fungal infection; if you see dense clusters of rods or cocci, it indicates a bacterial infection; if you see lively, eight-legged tiny insects, it indicates ear mites.
After the examination, the veterinarian will prescribe a targeted treatment; please follow the instructions carefully.
| Symptoms | Ear mites | Ear infection |
| Causes | Ear mite infestation | Overgrowth of yeast or bacteria |
| Appearance of discharge | Dry, dark brown, with a texture like damp coffee grounds | Thick, greasy, possibly with yellowish-green pus |
| Odor | Relatively mild odor, no distinct foul smell | Strong sour, fishy, or musty-sweet odor |
| Contagiousness | Highly contagious | Not contagious |
| Treatment | Combined internal and external parasite treatment | Veterinarian-prescribed antibiotic/antifungal ear drops |
• Regular deworming: Administer a combined internal and external deworming medication to your dog on time every month (or at the interval recommended by your veterinarian). This will greatly reduce the likelihood of parasites taking up residence in your dog’s body.
• Trim Ear Hair: Excessively thick ear hair can trap moisture inside like a wall. If you notice your dog’s ear hair is too thick, take them to a pet grooming salon to have the hair around their ears trimmed, ensuring proper airflow in their L-shaped ear canals.
• Keep Ears Dry: After a bath or swim, dry your dog’s ear canals promptly with a towel or a hairdryer set to cool air to prevent stagnant water from remaining in the ear canals and causing bacterial growth.
• Annual Comprehensive Physical Exam: Take your dog for a comprehensive health checkup once a year to assess its overall health, including the condition of its ears and mouth.
All content in this article is provided for informational purposes regarding daily pet care only and does not constitute, nor is it a substitute for, professional veterinary diagnosis, prescription, or treatment advice. If your dog exhibits any ear discomfort, severe pain, or unusual behavior, be sure to consult a licensed veterinarian promptly.
