Recurring ear infections usually mean something underneath the infection has not been resolved. Chronic otitis externa is long-term inflammation of the ear canal, most often driven by allergies, hormone disorders, ear canal shape, or a middle ear infection. Treating the bacteria or yeast alone helps for a while, but lasting relief depends on finding and managing the underlying cause.
What is chronic otitis externa?
Otitis externa is inflammation of the external ear canal, the passage between the ear flap and the eardrum. According to the Merck Veterinary Manual, it is one of the most common reasons dogs and cats visit a veterinarian.
The condition becomes chronic when it lasts for months or returns again and again. Over time, ongoing inflammation physically changes the ear canal, which makes each new infection harder to clear.
A dog's ear canal is L-shaped. It runs downward, then turns inward toward the eardrum, so debris and moisture do not drain easily. That shape is one reason dogs are affected more often than cats.
Ear infections keep coming back because bacteria and yeast are usually a symptom, not the starting point. Veterinarians group the causes of otitis externa into four categories.
Conditions that start the inflammation in a healthy ear, such as allergies, ear mites, foreign bodies like grass awns, and hormone disorders.
Traits that raise the risk, including floppy ears, narrow canals, excess hair, and frequent swimming.
Bacteria such as Staphylococcus and Pseudomonas, and yeast such as Malassezia, which overgrow in an inflamed ear.
Damage caused by long-term inflammation, like a thickened, narrowed, or calcified canal and infection behind the eardrum.
Allergies are the most common underlying cause in adult dogs. Environmental allergies and food allergies both inflame the skin lining the ear canal.
Hormone disorders can also drive chronic ear disease. Hypothyroidism and Cushing's disease (hyperadrenocorticism) both change the skin and immune response. Board-certified internal medicine specialists diagnose and manage these endocrine conditions.
Middle ear infection is often the hidden reason. Infection behind the eardrum, called otitis media, can reseed the outer canal after every course of ear drops.
Resistant bacteria make some cases harder. Merck notes that methicillin-resistant Staphylococcus pseudintermedius and Pseudomonas aeruginosa infections often last longer than two months and need culture-guided treatment.
The signs of chronic ear disease build gradually. Many owners notice them as a pattern that returns soon after medication stops.
Behavior changes count, too. The American College of Veterinary Surgeons notes that painful ears can make pets shy away from head pats and seem less responsive at home.
Most ear infections are not emergencies, but some ear-related signs need same-day care. Use this table as a general guide, and call us any time you are unsure.
Our emergency team in Tulsa is fully staffed 24 hours a day, 7 days a week, 365 days a year. No appointment is needed for emergencies.
Dogs with heavy, floppy ears, narrow canals, or a tendency toward allergies face the highest risk. Breeds commonly affected include:
In cats, chronic ear problems are less common. Ear mites are a frequent cause in kittens, and noncancerous growths called inflammatory polyps can block the canal in young adult cats. See the Merck guide to ear infections in cats for more.
Specialists diagnose chronic ear disease by looking past the current infection to the cause and the condition of the canal. A thorough workup may include:
Merck recommends CT or MRI for severe, chronic otitis that does not respond to appropriate treatment. Advanced CT imaging at Oklahoma Veterinary Specialists helps our team map the ear canal and middle ear before recommending a treatment plan.
A dog may need ear canal surgery when the canal is permanently blocked, calcified, or affected by a tumor. Medical treatment is always the first choice when the canal is still open and flexible.
Board-certified veterinary surgeons (DACVS) perform three main procedures:
TECA-BO removes the entire diseased ear canal and opens the middle ear to clean out infected tissue. The ear flap stays in place. This is the most common surgery for end-stage ear disease.
This procedure removes only the upright portion of the canal when the deeper, horizontal portion is healthy. Surgeons sometimes find during surgery that the full canal needs to come out.
This procedure opens the side of the canal to improve airflow and drainage. ACVS reports that most dogs with severe disease do not improve much after it, so it is usually reserved for dogs born with narrow canals.
90 to 95%of dogs have their ear drainage and discomfort resolved after TECA-BO, according to the American College of Veterinary Surgeons. Results depend on controlling the underlying cause.
ACVS states that ear canal removal is a complex surgery that should be performed by a board-certified veterinary surgeon. Learn more about the board-certified difference.
Most pets go home within 3 to 7 days after TECA-BO, depending on comfort. Recovery at home usually includes:
Every surgery carries risk, and your surgeon will discuss it openly. ACVS reports temporary facial nerve weakness in 25 to 50% of dogs, which becomes permanent in 10 to 15%.
Hearing is a common concern. Because most dogs with end-stage ear disease already hear poorly, ACVS notes that many owners notice little change after surgery. Many families instead notice a dog who is more comfortable and more like themselves again.
Keeping ear infections from returning depends on managing the underlying cause and staying consistent with care at home.
Oklahoma Veterinary Specialists works alongside your primary care veterinarian, not in place of them. Your family veterinarian often handles routine ear care and ongoing allergy management, and refers to us when a case needs more.
Our team can help when chronic ear disease involves:
After treatment, we share findings with your family veterinarian so your pet's care continues smoothly. Families come to our Tulsa hospital from Broken Arrow, Owasso, Bixby, Jenks, Claremore, and across northeastern Oklahoma.
If ear infections keep returning, ask your family veterinarian about a referral, or call us directly at 918-299-4900. For emergencies, come in any time, day or night.
Learn more at okvets.com.
Oklahoma Veterinary Specialists delivers 24-hour emergency care and board-certified specialty services with advanced technology and compassionate treatment.
