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Dog Ear Infection Symptoms in 2026
Quick Answer
The core signs of a dog ear infection are head shaking, scratching or pawing at the ear, odor, redness, swelling, and discharge, per PetMD (Dr. Rhiannon Koehler, DVM). Most owners assume a head tilt just means a sore ear — but the Merck Veterinary Manual reports that otitis media (middle ear infection) is found in over half of dogs with recurrent external ear infections, and a true neurological head tilt paired with stumbling, facial drooping, or uncontrolled eye movement means the infection has reached the middle or inner ear — a more serious problem than a routine outer-ear case. Catching that distinction early is what actually prevents permanent hearing loss or balance damage.
Most dog owners can spot the obvious signs of an ear infection — the head shaking, the smell, the constant scratching. What's harder to spot is the moment those symptoms mean something more serious than a routine outer-ear infection. Here's the full list of common signs, and the specific combination of symptoms that tells you the infection has moved deeper.
The Classic Signs of an Ear Infection
PetMD (Dr. Rhiannon Koehler, DVM, updated November 2025) lists eight core signs of a dog ear infection:
- Head shaking — the dog's attempt to dislodge debris and fluid from the canal
- Pawing at the ear — scratching to relieve itching or irritation
- Odor — a noticeably bad smell coming from the ear
- Discharge — often black or yellowish, depending on whether the cause is bacterial or yeast
- Redness inside the ear canal or flap
- Swelling of the ear canal or visible tissue
- Scabbing inside or around the ear
- Head tilt — but, as the next section explains, this one needs context
A dog with an ordinary outer-ear infection (otitis externa) will usually show several of the first seven signs together, and treatment with ear drops and, if needed, oral medication typically starts clearing things up within days. The eighth sign on PetMD's list — head tilt — is where owners most often misjudge how serious the problem actually is.
When It's More Than an Outer Ear Infection
Here's the distinction most symptom checklists skip: a dog in ear pain will often hold its head tilted to one side, but that alone is not a neurological sign — it can simply be the dog favoring a sore ear, the same way a person might tilt their head after an earache. A true neurological head tilt is different, and it means the infection has extended past the eardrum into the middle ear (otitis media) or inner ear (otitis interna), where the nerves controlling balance and facial movement actually run.
This isn't a rare complication. The Merck Veterinary Manual states plainly that "recurrent otitis externa suggests that otitis media might be present," and that otitis media is found in over half of dogs with recurrent external ear inflammation. In other words, a dog whose ear infections keep coming back has better-than-even odds of middle ear involvement — whether or not the more alarming signs below are obvious yet.
Watch specifically for these signs alongside a head tilt, since they're what actually distinguish middle or inner ear disease from a routine outer-ear case:
- Facial paralysis — inability to move one side of the face, blink, or close an eyelid, because the facial nerve runs directly through the middle ear
- Horner's syndrome — a drooping eyelid and a constricted pupil on the affected side
- Nystagmus — rapid, uncontrolled side-to-side eye movement
- Ataxia — stumbling, a faltering gait, or difficulty rising and walking normally
- Circling or falling toward the affected side
PetMD is direct about the stakes here: if "stumbling or a lack of coordination" accompanies a head tilt, that combination points to inner ear disease specifically, which is harder to treat and can leave a dog with permanent hearing loss and lasting balance problems. The Merck Veterinary Manual adds that once middle or inner ear infection is confirmed, treatment typically means an extended 3- to 6-week course of oral or injectable antibiotics — far longer than the week or two a routine outer-ear case usually needs — and that some nerve-related complications, like deafness or a permanent coordination deficit, can persist even after the infection itself clears. Early treatment is what specifically improves the odds of a full recovery.
Checking your dog's ears regularly with a pet ear otoscope for home inspection makes it easier to catch redness, discharge, or odor before head shaking becomes severe enough to trigger a hematoma or a deeper infection — useful context for your vet, not a substitute for a diagnosis.
How Common Is This, Really?
A peer-reviewed VetCompass study of 905,554 UK dogs (O'Neill et al., Companion Animal Health and Genetics, 2021) found a 7.30% one-year prevalence of ear infections overall, with Basset Hounds, Chinese Shar-Pei, and Labradoodles among the highest-risk breeds — see our dog ear infection cost guide for the full breed odds-ratio breakdown. What that cost guide doesn't cover is what happens when the same infection recurs: per Merck's over-50% middle-ear-involvement figure above, a dog on its second or third diagnosed ear infection is no longer just dealing with a routine, cheap-to-treat illness — it's approaching a coin-flip chance that the infection has already spread deeper, symptoms or not.
Embrace and MetLife both cover ear infections — including extended treatment for middle or inner ear involvement — on standard accident-and-illness plans, as long as your dog is enrolled before any symptom is recorded.
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For the core signs — head shaking, odor, discharge, redness, scratching — see a vet rather than waiting it out. PetMD is explicit that a vet needs to examine the eardrum before prescribing safe, effective medication, since some ear drops are damaging if the eardrum is already ruptured. If you see a head tilt combined with stumbling, facial drooping, or uncontrolled eye movement, treat it as more urgent: that combination specifically points to middle or inner ear disease, and delaying care is what turns a treatable infection into permanent nerve damage.
Does Pet Insurance Cover It?
Yes, as an illness claim on a standard accident-and-illness policy, once any waiting period has passed and as long as no ear symptom was recorded before coverage began. Because ear infections recur so often — and because recurrence is exactly what raises the odds of middle ear involvement — several major insurers, including Healthy Paws, Liberty Mutual, and Trupanion, treat a diagnosed ear infection as a permanent exclusion once it's on the record, with no symptom-free window that ever reopens coverage. See our other symptom guides for how this same pre-existing-condition logic applies across conditions, and enroll before the first infection is ever diagnosed if a breed-predisposed dog is still young and symptom-free.
Healthy Paws and Trupanion cover a first ear infection diagnosis on a standard accident-and-illness plan — just know that once diagnosed, neither insurer reconsiders a recurrence, even years symptom-free.
Get Healthy Paws Quote → Get Trupanion Quote →Frequently Asked Questions
What are the first signs of a dog ear infection?
PetMD (Dr. Rhiannon Koehler, DVM, November 2025) lists head shaking, pawing or scratching at the ear, odor, redness, swelling, scabbing, and discharge as the core early signs of a dog ear infection. Most dogs show more than one of these together, and the discharge is often black, yellowish, or waxy depending on whether the underlying cause is bacterial or yeast.
Is head tilting always a sign my dog's ear infection has spread?
Not on its own. Veterinary sources note that otitis media (middle ear infection) does not itself cause a true neurological head tilt — a dog in ear pain may simply hold its head to one side. A genuine neurological head tilt, especially alongside stumbling, loss of coordination, or circling, signals the infection has reached the inner ear (otitis interna), which is more serious and harder to treat.
How do I know if my dog's ear infection has spread to the middle or inner ear?
Watch for signs beyond the ear itself: facial paralysis (inability to move one side of the face, blink, or close an eyelid), Horner's syndrome (a drooping eyelid and constricted pupil on the affected side), uncontrolled eye movement (nystagmus), and ataxia — stumbling or a faltering gait. The Merck Veterinary Manual notes these develop because nerves controlling the face and balance pass directly through the middle and inner ear.
How common are ear infections in dogs?
A peer-reviewed VetCompass study of 905,554 UK dogs (O'Neill et al., Companion Animal Health and Genetics, 2021) found a 7.30% one-year prevalence. More importantly for symptom severity, the Merck Veterinary Manual reports that otitis media (middle ear infection) is found in over half of dogs with recurrent external ear infections — meaning a dog whose ear infections keep coming back has better-than-even odds of middle ear involvement, whether or not the classic neurological signs are obvious yet.
Can a dog ear infection cause permanent damage?
Yes. PetMD warns that delaying treatment lets an infection progress into the inner ear, which can cause permanent hearing loss and lasting balance problems. The Merck Veterinary Manual adds that even with treatment, some nerve-related complications — deafness and loss of coordination — can persist after the infection itself has cleared, which is why early treatment specifically improves the odds of a full recovery.
Will pet insurance cover a dog's ear infection symptoms?
Yes, as an illness claim on a standard accident-and-illness policy, once any waiting period has passed and as long as no ear symptom was recorded before coverage began. Because ear infections recur so often, several major insurers — including Healthy Paws, Liberty Mutual, and Trupanion — treat a diagnosed ear infection as a permanent exclusion once it's on the record, so enrolling before the first symptom appears matters more than for a one-time illness.
What should I do if I notice these signs?
See a vet for any of the core signs — head shaking, odor, discharge, redness, or scratching — rather than waiting to see if it clears on its own, since PetMD notes a vet needs to assess the eardrum before prescribing safe medication. Treat a head tilt paired with stumbling, facial drooping, or uncontrolled eye movement as more urgent: those combined signs point to middle or inner ear involvement and warrant prompt veterinary attention, not a wait-and-see approach.
Last updated: September 29, 2026