CONDITION
Otitis Media
Otitis media refers to inflammation within the middle ear — the small, air-filled chamber that sits behind the eardrum. This space is normally sealed off from the outside world, but inflammation here can arise when infection or other processes extend inward from the external ear canal, or less commonly when material travels up through the tube that connects the middle ear to the back of the throat. Because the middle ear sits close to important structures including nerves and the inner ear, changes here can produce effects that extend beyond what an owner might associate with a typical ear problem. Many owners first notice signs that overlap with outer ear inflammation — head shaking, ear discomfort, or discharge — but some dogs and cats show additional patterns such as a head tilt, reluctance to open the mouth fully, or changes in balance. In other cases, otitis media is identified during investigation of a persistent or recurring outer ear problem that has not responded as expected. The condition is not always obvious from the outside, and the signs an owner observes often depend on whether the eardrum remains intact and how much the inflammation affects neighbouring structures. This page explores the signals that can appear when the middle ear is involved, the mechanisms that allow inflammation to develop in this normally protected space, the ways otitis media is investigated and confirmed, and the range of approaches used to address it. The goal is to help owners understand what may be happening and what shape the conversation with their veterinary team might take.
Why this matters now
Otitis media can develop at any age, but it tends to be seen more often in dogs and cats with a history of long-standing or recurrent outer ear inflammation. Breeds predisposed to chronic ear canal disease — such as Cocker Spaniels, Shar Peis, and cats with narrow ear canals or underlying allergic conditions — may be at higher risk, though any animal can be affected if the right conditions arise. In some cases, the middle ear becomes involved following a single severe episode of outer ear infection; in others, it represents the culmination of repeated cycles of inflammation over months or years.
The condition often progresses gradually, particularly when it develops as an extension of chronic outer ear disease. Early inflammation may produce subtle signs that overlap with what an owner has seen before, making the shift into the middle ear difficult to recognise without examination. In other animals, the eardrum ruptures early, allowing material to drain outward and sometimes creating the impression that the problem is limited to the outer ear. The timeline and severity vary widely between individuals, and some animals show little outward change until inflammation begins to affect structures beyond the middle ear itself.
Signals & patterns
Early signals
Persistent head shaking
The dog or cat may shake their head more frequently or more vigorously than during previous episodes of ear discomfort, sometimes without obvious visible discharge. This can reflect irritation or pressure changes within the middle ear that do not produce the same outward signs as outer ear inflammation.
Reluctance to be touched near the ear
An animal that previously tolerated ear handling may begin to pull away, flatten the ears, or show discomfort when the area around the base of the ear is approached. This can indicate deeper pain that is not always apparent from the outside.
Odour or discharge not improving
In cases where outer ear treatment has been ongoing, a persistent smell or discharge that does not respond as expected may suggest that inflammation has extended beyond the external canal. The quality of the discharge may remain similar, but the pattern of response changes.
Subtle change in ear carriage
One ear may be held slightly lower or at a different angle, or the animal may tilt the head very gently to one side. These shifts can be easy to miss, particularly in the early stages when the tilt may be intermittent or mild.
Later signals
Pronounced head tilt
A more obvious tilt, where the affected ear is held lower and the head position becomes persistent, can develop as inflammation within the middle ear increases or as nearby structures become involved. The tilt may worsen over days to weeks if the condition progresses.
Difficulty chewing or yawning
Some animals show reluctance to open the mouth fully, chew on one side, or appear uncomfortable when yawning. This occurs because the jaw joint sits very close to the middle ear, and inflammation in this area can make normal jaw movement painful.
Changes in balance or coordination
The dog or cat may seem unsteady, particularly when turning or navigating steps, or may circle toward the affected side. These patterns can emerge when inflammation affects the structures involved in maintaining balance, which sit adjacent to the middle ear.
Facial asymmetry or drooping
In some cases, one side of the face may appear different — an eyelid may not close fully, the lip may droop, or the nostril may seem less mobile. This occurs when inflammation affects a nerve that runs through the middle ear and controls facial movement on that side.
Click to read about the biological mechanisms
How this is usually investigated
Investigation of suspected otitis media typically begins with a detailed history of ear problems — their duration, treatments already tried, and any patterns the owner has noticed. The outer ear and eardrum are then examined, often using an otoscope to assess whether the eardrum is intact, thickened, or bulging, though visualisation can be difficult if the ear canal is inflamed or filled with discharge. When the clinical picture suggests middle ear involvement, or when outer ear disease has not responded as expected, imaging and sometimes sampling of material from the middle ear itself may follow.
Otoscopic examination
Diagnostic imaging
Myringotomy and middle ear sampling
Cytology and culture of ear discharge
Options & trade-offs
Management of otitis media is usually shaped by the findings on examination and imaging, the presence or absence of infection, and the response to earlier treatments. Most approaches combine measures to reduce inflammation, address infection if present, and manage the underlying factors that allowed the middle ear to become involved. Different combinations suit different animals and owners, depending on the severity of changes, the practical demands of treatment, and what the individual animal will tolerate.
Antimicrobial therapy
Antibiotics or antifungal medications, given by mouth or sometimes applied directly into the ear, target bacteria or yeast identified on culture. Treatment courses can be prolonged, often lasting several weeks, and the choice of drug is guided by sensitivity testing when available. In some cases, a combination of systemic and topical therapy is used.
Trade-offs: Topical medications cannot reliably reach the middle ear if the eardrum is intact, and systemic drugs require consistent administration over weeks. Some infections prove resistant to commonly used antibiotics, and prolonged courses can be difficult to sustain in animals that resist medication.
Anti-inflammatory medication
Corticosteroids or other anti-inflammatory drugs, given systemically or applied topically, can reduce swelling and fluid production in the middle ear and surrounding tissues. This may improve comfort and allow better drainage if the eardrum has ruptured, though these medications do not address infection directly.
Trade-offs: Anti-inflammatory drugs can mask signs of worsening infection if used without concurrent antimicrobial therapy. In animals with certain other health conditions, prolonged use of systemic corticosteroids may carry additional considerations.
Ear flushing under anaesthesia
A thorough cleaning of the ear canal and middle ear, performed under general anaesthesia, removes accumulated debris, thick discharge, and inflammatory material that can sustain infection. Flushing allows better visualisation of the eardrum and middle ear structures and can improve the effectiveness of medical treatment that follows.
Trade-offs: The procedure requires anaesthesia and carries a small risk of inadvertently introducing material into the inner ear or causing temporary balance disturbance. It addresses accumulated material but does not resolve underlying structural changes or prevent recurrence without concurrent medical management.
Surgical intervention
In cases where medical management has not controlled the condition, or where imaging shows significant structural changes, surgery to open and drain the middle ear chamber — sometimes combined with removal of diseased tissue or part of the ear canal — may be considered. This allows direct access to the affected space and can remove chronically inflamed or infected tissue that sustains the problem.
Trade-offs: Surgery carries the inherent considerations of general anaesthesia and a recovery period, and potential complications include temporary or permanent facial nerve damage, hearing loss, or changes in balance. It tends to be reserved for cases that have not responded to other measures or where structural changes make medical management impractical.
Management of underlying factors
Addressing conditions that predispose to ear disease — such as allergic skin disease, hormonal imbalances, or conformational factors like narrow ear canals — can reduce the likelihood of recurrence. This may involve dietary trials, medication for allergic inflammation, or changes in ear care routines.
Trade-offs: Identifying and managing underlying factors can be time-intensive and may require trial periods to assess effectiveness. Even with good control of predisposing conditions, some animals experience recurrent episodes.
Common misconceptions
"If the ear canal looks better after treatment, the middle ear infection has also resolved."
Improvement in the outer ear does not always mean the middle ear has cleared, particularly if the eardrum is intact and material cannot drain outward. Some animals show persistent middle ear inflammation even when the visible part of the ear appears much improved, and follow-up imaging or examination may be needed to assess response.
"Otitis media always causes obvious pain or a head tilt."
Many dogs and cats with middle ear inflammation show only subtle signs, or signs that overlap with outer ear disease, such as occasional head shaking or ear rubbing. A head tilt or balance disturbance suggests the inner ear or associated nerves are affected, but these are not present in all cases, and some animals are identified only when imaging is performed for other reasons.
"Once the infection is treated, the middle ear will return to normal."
Chronic inflammation can cause lasting changes to the tissue lining the middle ear and the surrounding bone, even after infection has been cleared. Some animals are left with thickened tissue, partial hearing loss, or an increased tendency for fluid to accumulate, making recurrence more likely without ongoing attention to underlying factors.
Related conditions
Otitis Externa in Cats
Otitis externa—inflammation of the outer ear canal—is the most common pathway through which infection or inflammation reaches the middle ear, particularly when the eardrum becomes damaged or perforated. Many dogs and cats with otitis media have a history of persistent or recurring outer ear problems.
Otitis Interna
Inflammation can extend from the middle ear into the inner ear structures that control balance and hearing, a progression that may explain why some animals with otitis media develop more pronounced head tilt, circling, or loss of coordination. The two conditions share anatomical proximity and often similar underlying causes.
Immune-Mediated Polyarthritis
Nasopharyngeal polyps are benign growths that can develop in the middle ear or the passage connecting it to the back of the throat, and they may produce signs that overlap with otitis media, including head shaking, ear discomfort, or changes in how the head is carried. In some cases, secondary inflammation around a polyp can mimic or coexist with middle ear infection.
Horner's Syndrome
Inflammation or infection in the middle ear can affect nearby nerves that control the muscles and tissues around the eye, leading to the drooping eyelid, sunken appearance, and small pupil characteristic of Horner's syndrome. This collection of changes may appear on the same side as the affected ear and can be a clue that middle ear structures are involved.
Ear Mites
Ear mites in the outer canal can trigger inflammation and secondary bacterial or yeast infection that, if persistent or inadequately managed, may progress inward and contribute to middle ear involvement. The mites themselves do not typically invade the middle ear, but the inflammatory environment they create can set the stage for deeper infection.
Otitis media often sits within a broader pattern of ear or skin health, and understanding the factors that allowed the middle ear to become involved can shape the longer view. Some owners find it useful to explore the relationship between ear disease and allergic or immune-mediated conditions, particularly in animals with a history of skin or ear problems in other areas. The practical shape of follow-up — how response is monitored, when repeat imaging might be considered, and what changes might prompt re-evaluation — can also form part of the conversation as the picture becomes clearer.