Black Gunk in My Dog’s Ear: 5 Likely Causes + Vet Tips

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owner cleaning their dog's ear with a tissue

This article was updated on October 19th, 2023

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The presence of black gunk or discharge in a dog’s ear is an extremely common reason that pet parents bring their dog to our veterinary clinic. They are right to do so, as black gunk can be a sign of an ear infection or other ear conditions that need veterinary treatments.

The discharge is often a combination of ear wax, dirt, and other debris that has accumulated in the ear canal. In some cases, the discharge may be dark brown or black in color due to the presence of dried blood, as shown on the picture below.

black gunk inside the ear of a dog
Black gunk inside a dog’s ear

In this article, we will review:

  • what a normal dog’s ear should look like,
  • the top causes of black gunk or debris in a dog’s ear, and
  • how to help your dog.

What a normal ear looks like

A normal dog’s ear will be clean and have the appearance of pink, healthy skin, as shown in the picture below:

healthy dog ear
Normal ear

4 common causes of black gunk (discharge) in a dog’s ears

The most common causes include:

1. Ear infections

Ear infections are the most likely cause of black gunk or debris in a dog’s ear.
How do you know if your dog has an ear infection?
The black discharge is usually accompanied by other symptoms, including:

  • Head shaking
  • Tilting head to the side or holding ear(s) in an abnormal way 
  • Scratching or rubbing at the ear(s)
  • Redness, irritation or swelling of the ear canal
  • Scabbing or crusting around the ear(s)
  • Foul odor from the ear(s)
  • Painful ear(s) when touched

Below is a picture of dark debris observed in a dog’s ear as a result of an ear infection. The external ear canal also appears red and inflamed.

Black gunk in a dog's ear with redness and inflammation
Black gunk in a dog’s ear with redness and inflammation

Expert tip:

“The issue in your dog’s ear is more likely to be an infection if it has a foul odor when sniffed.”

Dr. Whittenburg (DVM)

Veterinarian Director at Senior Tail Waggers

Most simple ear infections are caused by bacteria and/or yeast and will resolve within two weeks of treatment with topical products containing antibiotics, antifungals, and anti-inflammatories.
Learn more about Ear Infections & Home Remedies for Mild Ear Infections.

2. Allergies

Dogs with allergies frequently develop chronic or recurrent skin and ear infections. This can lead to the accumulation of black discharge in the ear. Dogs can be allergic to fleas, food, or something in the environment. Below is a picture of a pug’s ear with redness and black debris as a result of allergies:

allergy symptoms in a dog's ear, including redness and black debris
Redness and black debris as a result of allergies

How do you know if your dog’s black gunk in ears is due to allergies?
Dogs with allergies often exhibit symptoms such as itchy skin, red rash, hair loss, and secondary infections. Allergies can be extremely frustrating for both dogs and pet parents, as even dogs with well-managed allergies can experience flare-ups.
Learn more about Allergies Causing Ear Infections.

3. Something in the ear canal

Sometimes foreign objects, such as grass or foxtails, can become lodged in a dog’s ear, leading to irritation and inflammation. This will likely cause the same signs as an ear infection, and may lead to discharge or debris.

Your vet may be able to examine and remove the object on otoscopic exam or perform an ear flush under sedation or anesthesia. Additionally, some animals can develop masses within the ear canal.

4. Ear mites

Most pet parents have heard of ear mites. These tiny infectious parasites, known as Otodectes cynotis, live in the ear canal and cause pruritus (itching), irritation, and inflammation. However, they are actually not very common in dogs.

In addition to causing clinical signs of an ear infection, ear mites lead to the accumulation of black discharge in the ear, which is often described as looking like coffee grounds. Below is an example of dark brown/black debris in a dog’s ear due to ear mites:

brown discharge in dog ear from mites
Black gunk in a dog’s ear as a result of mites

Diagnosing ear mites involves your vet taking a swab from your dog’s ear to examine under the microscope, in which the mites will be easily visible.

“Ear mites in dogs (as opposed to cats) are relatively rare, and the issue is much more likely to be an infection.”

Dr. Whittenburg (DVM)

Veterinarian Director at Senior Tail Waggers

5 easy tips to help your dog

If you notice black gunk in your dog’s ears, it’s important to have them examined by a veterinarian to determine the underlying cause and receive proper treatment. The tips below are not a substitute for proper veterinary care. Here are some general steps you can take to help your dog (while you wait for your vet appointment):

1. Keep the ears clean

Use a gentle ear cleaner recommended by your veterinarian to clean your dog’s ears. Gently wipe away any debris using a clean cloth or cotton ball. Do not use cotton swabs, as they can push debris further into the ear canal and cause injury. Learn more about ear cleaning solutions for dogs.

dog getting his ear cleaned

2. Keep the ears dry

Moisture can exacerbate ear issues, so it’s important to keep the affected ear as dry as possible. If your dog is a frequent swimmer or loves to get their ears wet in the bath, they may benefit from an ear cleaner containing a drying product.  

keeping a dog's ear clean and dry

3. Prevent scratching

Ear issues can be very uncomfortable for dogs, and they may scratch or rub their ears excessively. This can lead to further irritation and potential injury. If this is the case with your dog, you may need to use an Elizabethan collar (cone) to prevent your dog from scratching their ears.

cone on a dog

4. Carefully monitor for improvement

Keep an eye on your dog’s ears and monitor for any signs of improvement or worsening. If the black gunk does not improve or if your dog exhibits other concerning symptoms, such as shaking their head or whining in pain, contact your veterinarian for further evaluation.

5. Do NOT put anything else in your dog’s ear

Never put anything into your dog’s ear that has not been recommended or approved by your veterinarian. Not only do these products fail to treat ear infections, they can actually cause your dog additional pain and irritation, and lead to significant and permanent damage if your dog has a ruptured eardrum. 

Ear infections rarely clear up without veterinary treatment

If you catch an ear infection in the early stages and it appears to be mild, you can try to manage it at home (read our article with home remedies for ear infections).

Be aware that ear infections rarely clear up without the appropriate veterinary treatment. Delaying veterinary care might make things worse for your dog – and ear infections can make dogs miserable. 

If the symptoms get worse or persist without signs of improvement, schedule an appointment with your veterinarian.

Signs you need to see your vet ASAP

If your dog’s mild ear infection is not improving with cleaning at home after a couple of days, OR you notice the following signs, it is important to see your vet as soon as possible.

  • Painful ears
  • Blood or purulent (pus) discharge in the ears
  • Change in hearing or balance
  • Ear hematoma (swelling of the ear flap) 
  • Other signs of systemic disease such as decreased appetite or lethargy

Read More:

Most Common Ear Infections in Dogs

Home Remedies for Dog Ear Infections

Dog Ear Wax Color Chart: What Do These Colors Mean?


  • Dr. Liza Cahn, Veterinarian

    Dr. Liza Cahn is a veterinarian who graduated from Michigan State University’s College of Veterinary Medicine in 2013 with a Doctorate of Veterinary Medicine (DVM). Dr. Cahn has five years of experience working as a veterinarian in small animal practice in Washington and California. She loved working with dogs and cats and educating owners on all aspects of veterinary medicine, especially animal behavior and dermatology. She has since transitioned to remote work to be able to spend more time at home with her husband, two young kids, and two cats, and is thrilled to be able to combine her love for veterinary medicine and passion for writing. Dr. Cahn has an active veterinary license in Washington State.

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Disclaimer: This website's content is not a substitute for veterinary care. Always consult with your veterinarian for healthcare decisions. Read More.

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