Dog Ear Mites Symptoms: How to Tell If Your Dog Has Them and What to Do

If you’ve noticed your dog scratching at their ears relentlessly or shaking their head more than usual, it’s completely understandable to feel worried. Ear mites are one of the most common culprits behind ear discomfort in dogs, and the good news is that they’re very treatable once identified. Understanding what to look for can help you act quickly and get your furry friend the relief they deserve.

Common Causes

Ear mites in dogs are caused by a tiny parasitic organism called Otodectes cynotis, which takes up residence in the ear canal and feeds on skin debris and ear wax. While the mites themselves are the direct cause of the problem, several factors can increase your dog’s risk of picking them up in the first place.

• Direct contact with an infected animal. Ear mites spread easily through close contact with other dogs, cats, or wildlife that are already infested. Dogs that spend time in kennels, dog parks, or multi-pet households are at higher risk.
• Outdoor exposure. Dogs that roam outdoors or come into contact with stray or feral animals have more opportunities to encounter mites in the environment.
• Young age. Puppies have less developed immune systems and are more susceptible to ear mite infestations than healthy adult dogs.
• Shared bedding or grooming tools. Mites can survive briefly in the environment, meaning your dog could potentially pick them up from contaminated bedding, brushes, or other shared items.
• Living with an infected pet. If one pet in your household has ear mites, it’s highly likely that other animals sharing the same space will become infested as well.

What makes Otodectes cynotis particularly sneaky is how quickly it completes its life cycle. From egg to adult, the entire process takes roughly three weeks, which means a small infestation can become a significant one before you’ve even noticed the first scratch. Adult mites can also survive for a short time off a host — typically a few days — which is why shared sleeping areas and grooming tools can act as unexpected transmission points even without direct animal-to-animal contact.

Diagnosing the cause is something your veterinarian does by examining a swab of the ear discharge under a microscope. The mites themselves, though tiny, are visible this way, and a trained eye can distinguish them from the debris associated with bacterial or yeast infections. In some cases, your vet may also use a video otoscope — a small camera inserted gently into the ear canal — to get a clearer picture of what’s happening inside.

There’s no strong seasonal pattern specific to ear mites the way there is with, say, flea infestations, but transmission risk does rise during warmer months when dogs are more active outdoors and socializing more frequently with other animals. Age remains one of the most consistent risk factors — puppies under six months old are diagnosed with ear mites far more often than adult dogs, likely because their immune response to the mite’s presence is still maturing.

Knowing how ear mites are transmitted can help you take preventive steps, especially if your dog is frequently around other animals.

Symptoms to Watch For

One of the challenges with ear mites is that their symptoms can closely resemble those of a bacterial or yeast ear infection. However, there are some telltale signs that point specifically toward a mite infestation. Paying close attention to your dog’s behavior and the appearance of their ears can give you valuable clues.

• Intense, persistent scratching at the ears. This is often the first and most obvious sign. Your dog may scratch so frequently and forcefully that they cause minor cuts or abrasions around the ear.
• Frequent head shaking. Dogs instinctively try to dislodge the irritation by shaking their heads, sometimes so vigorously that it becomes concerning to watch.
• Dark, crumbly discharge in the ear canal. This is one of the most distinctive signs of ear mites. The discharge often looks like dark brown or black coffee grounds and is a mixture of wax, dried blood, and mite debris.
• Redness and inflammation inside the ear. The skin inside the ear canal may appear red, irritated, or swollen due to the constant scratching and the mites’ activity.
• Unpleasant odor coming from the ear. While a mild odor can accompany ear mites, a very strong smell may indicate a secondary bacterial or yeast infection has developed alongside the infestation.
• Crusting or scabbing around the outer ear. Self-inflicted wounds from scratching can lead to scabs forming around the base of the ear or on the outer flap.
• Hair loss near the ears. Chronic scratching and rubbing can cause patches of hair to thin or fall out around the ear area.

It’s worth noting that some dogs may carry a significant mite infestation with minimal symptoms, while others show extreme discomfort even with a smaller number of mites. Every dog responds a little differently.

Symptom Severity at a Glance

Use this quick-reference table to help you decide how urgently your dog needs attention based on what you’re observing.

Symptom	Risk Level	Action Required
Mild, occasional ear scratching	Mild	Monitor at home for 24–48 hours
Dark, coffee-ground discharge in the ear	Mild–Moderate	Schedule a vet appointment within a few days
Frequent head shaking with visible ear debris	Moderate	Call your vet within 24 hours
Redness, swelling, or strong odor from the ear	Moderate–Serious	Call your vet within 24 hours
Open sores or bleeding from scratching	Serious	Seek veterinary care today
Significant pain when ear is touched	Serious	Seek veterinary care today
Facial swelling or balance problems alongside ear symptoms	Serious	Seek emergency veterinary care immediately

Breeds Most at Risk

While any dog can develop an ear mite infestation regardless of breed, certain dogs face a higher likelihood of repeated or severe infestations due to their anatomy or lifestyle tendencies.

• Basset Hounds and other long-eared breeds. Dogs with heavy, pendulous ears — including Cocker Spaniels, Bloodhounds, and Basset Hounds — have ear canals that naturally trap more warmth and moisture. This environment makes it easier for mites to establish themselves and harder for owners to spot early warning signs, since the ear flap obscures visibility.
• Jack Russell Terriers and other high-energy working breeds. Terriers bred for outdoor work tend to spend significant time investigating burrows, brush, and wildlife — all common sources of mite exposure. Their adventurous nature simply puts them in contact with infected animals more frequently than breeds content to lounge indoors.
• Dogs in multi-pet households regardless of breed. This isn’t breed-specific, but it’s worth noting: any dog living alongside cats is at meaningfully higher risk. Cats are one of the most common reservoir hosts for Otodectes cynotis, and because cats are often more stoic about ear discomfort, they can harbor mites and pass them to dogs without obvious symptoms of their own.

What You Can Do at Home

If you suspect your dog has ear mites, there are a few steps you can take at home before or while awaiting a veterinary appointment. However, it’s important to approach this carefully, as improper cleaning or treatment can sometimes make things worse.

Start by gently examining your dog’s ears in good lighting. Look for the characteristic dark, coffee-ground-like debris in the ear canal. Avoid inserting anything deep into the ear, as this can push debris further in or damage the delicate ear structures.

You can carefully clean the outer portion of the ear using a veterinarian-approved ear cleaning solution and a cotton ball. Never use cotton swabs inside the ear canal, as these can compact debris and cause injury. Keeping your dog comfortable and preventing further self-trauma is also important — if your dog is scratching intensely, consider using a soft e-collar (cone) temporarily to prevent wound formation.

While there are some over-the-counter ear mite treatments available at pet stores, it’s strongly advisable to confirm the diagnosis with your vet before beginning any treatment. Many ear conditions look similar, and using the wrong product can delay proper care or cause additional irritation. If you have other pets in the home, keep them separated from your dog until the situation is assessed, since ear mites are highly contagious between animals.

When to See a Vet

You should schedule a veterinary appointment as soon as possible if you notice any of the symptoms described above. While ear mites are not a life-threatening condition, they cause significant discomfort and can lead to more serious complications if left untreated. Secondary bacterial or yeast infections are common in dogs who have been scratching persistently, and these typically require their own course of treatment.

Seek prompt veterinary care if your dog is scratching so intensely that they’re causing open sores or bleeding, if you notice a strong or foul odor from the ear, if your dog seems to be in pain when their ear is touched, or if there is significant swelling around the ear canal. These signs may indicate that a secondary infection has taken hold and needs medical attention right away.

Your veterinarian will typically diagnose ear mites by examining a sample of the ear discharge under a microscope and will recommend an appropriate treatment, which may include prescription ear drops, topical antiparasitic medications, or a thorough in-clinic ear cleaning. Most cases resolve fully with proper treatment.

How Pet Insurance Can Help

Vet visits, prescription medications, and follow-up appointments can add up quickly, even for a relatively straightforward issue like ear mites. Having a pet insurance plan in place means you can focus on getting your dog the care they need rather than stressing about the cost. Many plans cover parasite-related treatments and office visits, making them a smart investment for any dog owner.

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.

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Ear mites are uncomfortable for your dog, but with the right care and attention, they’re very manageable. By catching the signs early and working with your veterinarian, you can have your pup feeling comfortable and itch-free in no time. Your dog is lucky to have someone paying such close attention to their health and well-being.