A dog ear infection is inflammation of the ear canal, usually driven by allergies, moisture or ear mites, which lets yeast and bacteria overgrow. Head shaking, scratching, redness, smell and discharge are the signs. It needs a vet check and usually prescription drops, because the right treatment depends on what is causing it.
The clinical name is otitis externa, and it is rarely a one-off event. Otitis externa affects around 7.3% of UK dogs under primary veterinary care each year. Once a dog has had one infection, the ear canal is often more prone to another, and ears rarely act in isolation from the rest of the body.
What ear infections do dogs get?
Dogs get three kinds of ear infection, named by how deep they go. Outer ear infection, or otitis externa, affects the canal you can see and is by far the most common. Middle ear infection, otitis media, sits behind the eardrum. Inner ear infection, otitis interna, is the deepest and can affect balance and hearing.
Most middle and inner ear infections start as an outer ear problem that was not caught or fully treated. That is why an itchy, smelly ear is worth getting checked early rather than left to see if it settles.
Why is my dog getting ear infections?
Allergies are the most common cause, usually to food or to things in the environment. They inflame the skin lining the ear canal and make it warm, moist and irritated. That lets the yeast and bacteria that normally live there get out of hand.
Ear mites come next. They are more common in puppies and in homes with outdoor cats or rabbits, and they cause intense itching with a dark, crumbly discharge. Water from swimming or bathing, left to sit in the ears, sets up the same conditions in otherwise healthy dogs.
Breed and ear shape matter more than most owners expect. Dogs with drooping ears carry a meaningfully higher risk than those with upright ears, because the flap traps warm air against the skin. French Bulldogs are a slightly different story, and we explain the gut link behind their ear infections separately.
Less common causes include grass seeds and other foreign bodies, especially in summer, growths in the canal, and hormone conditions such as an underactive thyroid.
Key takeaway: if your dog gets repeated infections rather than one isolated episode, the ear itself is rarely the whole story, and something underneath needs investigating.
What are the symptoms of a dog ear infection?
The main dog ear infection symptoms are head shaking, scratching at the ear, redness, swelling, a bad smell and discharge. Many dogs also flinch or cry when the ear is touched. Use this table to judge how quickly to act.
Ring your vet today if your dog is shaking their head constantly, crying when the ear is touched, or has any discharge with a smell. Untreated infections can spread from the outer canal into the middle or inner ear, which can mean balance and hearing problems that do not resolve on their own.
Ear pain does not always look like ear pain. A sore dog may hold their head differently or react badly to being touched, much like the signs in our guide to a dog yelping when getting up, long before the smell becomes obvious.
What is the treatment for a dog ear infection?
Treatment for a dog ear infection usually means prescription ear drops after your vet has looked down the canal and taken a swab. The swab shows whether bacteria, yeast or mites are to blame, so the drops can be matched to the cause.
Dog ear infection drops often combine an antibiotic, an antifungal and an anti-inflammatory. Your vet will also check the eardrum is intact before choosing one, as some drops are unsafe behind a damaged drum. Antibiotics by mouth, pain relief, or a flush under sedation may be needed for severe or long-standing cases.
Finish the full course, even once the ear looks better, and go back for the recheck. Stopping early is one of the commonest reasons a dog's ear infection will not go away.
Is there a home remedy for a dog ear infection?
No, there is no safe home remedy for a genuinely infected ear. Myth: anything "natural" is safe to pour into a sore ear. Olive oil, or worse, a home vinegar rinse, is not a treatment for a painful, inflamed ear.
In my view as an MRCVS-registered vet, home remedies are a common reason an infection gets worse before a dog is finally checked. Oil might loosen wax in a healthy ear. But if there is an infection underneath, you push fluid and debris further down a canal that is already sore. And without a swab you cannot know whether you are dealing with bacteria, yeast or mites.
What is safe is gentle, routine ear checking. Lift the flap once a week and look for redness, swelling or a new smell. Learn what normal looks and smells like for your dog, so you catch changes early. If the ear looks clean and calm, a vet-approved cleaner used exactly as directed can help with everyday debris. That is maintenance, not treatment.
Why does my dog's ear infection keep coming back?
A dog's ear infection usually keeps coming back because the underlying cause, most often allergy, has not been managed. Each flare is treated, but the trigger is still there. For these dogs, managing the allergy matters more than treating each ear in isolation, so ask your vet about a full work-up.
Prevention starts with drying the ears properly after swimming or bathing. Keep hair trimmed around the canal if your dog's coat tends to trap moisture there.
Diet is part of the picture too, though it has limits. Juno Daily is a daily supplement, not a medicine, and it will not treat an active ear infection.
What Juno Daily for itchy skin can do is support the skin and immune balance that make some dogs more prone to flare-ups. The omega-3 DHA in it is a fatty acid that helps calm the inflammation behind itchy, allergic skin. In allergy-prone dogs, that may mean less scratching generally, not just around the ears.
The postbiotics and beta glucans in it support a settled immune response rather than an overreactive one. That is the same immune system that drives allergic ear disease in many dogs. The formula works gut-first, because much allergic skin and ear trouble involves an immune system reacting to things it should tolerate. It is not a substitute for allergy testing or prescribed treatment, but it can be one part of managing a dog with repeated ear trouble.
Spotting small changes in your dog's ears early is the best way to stop a simple irritation turning into a long-term or complicated infection.
If your dog is prone to allergies or repeated ear trouble, look at their daily diet and support routine alongside whatever your vet prescribes. Juno Daily is one part of that, helping skin and immune balance day to day, not replacing treatment when an ear is already infected.
Ear trouble is uncomfortable to watch, but with a proper diagnosis and the right daily support, most dogs settle well. If you would like a second opinion on your dog's ear health or diet, you can book a free 15-minute call with our team.
Frequently asked questions
What is the fastest way to cure a dog ear infection?
There is no single fastest cure. The quickest route is an early vet visit, so the type of infection can be identified and the right drops started straight away. Guessing with home products usually slows things down.
Can I buy dog ear infection medicine over the counter?
Ear cleaners are sold over the counter, but the drops that treat an infection are prescription medicines in the UK. The right one depends on whether bacteria, yeast or mites are to blame, and on whether the eardrum is intact, which only an examination can show.
How long does a dog ear infection take to clear?
A simple outer ear infection often settles within one to two weeks of the right treatment. Long-standing or deep infections take longer. Finish the full course and attend the recheck, even if the ear looks better sooner.
Can a dog ear infection spread to the brain?
Very rarely. A deep inner ear infection can, in rare cases, spread beyond the ear, which is why head tilt, loss of balance or circling is treated as an emergency. Treating outer ear infections early is the best protection.
Are dog ear infections contagious?
Most are not. Bacterial and yeast infections come from your dog's own ear environment and do not pass between pets. Ear mites are the exception: they spread easily between dogs, cats and rabbits, so other pets may need treating too.
Are ear infections painful for dogs?
Yes, most dogs find them genuinely uncomfortable, not just mildly irritating. The inflammation and pressure can cause real distress, leading to head shaking, scratching and reluctance to have their ears touched.
Which dogs are most prone to ear infections?
Dogs with long, floppy ears or hairy ear canals, such as spaniels and Basset Hounds, carry a higher risk. So do dogs with skin allergies and dogs that swim often. For these dogs, weekly ear checks and careful drying make a real difference.
This guide is for informational purposes only and does not constitute veterinary advice. Always consult your vet before making changes to your dog's diet, supplement routine, or healthcare plan.
