Course 10 · Ears · Lesson 8 of 12

What do smell, discharge and redness mean for referral?

Published 29 October 2026 · Updated 29 October 2026 · About 5 minutes · General information only. This lesson does not diagnose or treat any condition.

Smell, discharge and redness mean an ear needs veterinary assessment, not home cleaning, home treatment or a wait to see if it settles. These are warning signs that the ear is inflamed, infected, injured or affected by an underlying problem, and they need a professional examination of the canal, a diagnosis and a treatment plan. Home cleaning can push discharge deeper, irritate inflamed skin, mask the signs a vet needs to see, and delay treatment while the problem worsens. The correct home response is to stop cleaning, note what was seen and smelled, keep the dog comfortable, and seek veterinary advice promptly, with a clear description of the signs.

What does a strong smell mean?

A strong, unpleasant, yeasty or sweet smell from an ear means something has changed in the ear environment, and it needs assessment. Healthy ears have little or no smell, and a smell that is noticeable from a normal distance, or that has developed recently, is a warning sign, even if the ear looks clean at a glance. Smell can accompany wax build up, infection, inflammation, a foreign object, or an allergy related problem, and the cause cannot be judged by smell alone. Do not try to remove the smell by cleaning more, by using a scented product, or by applying a home remedy, because those actions can irritate the ear and hide the pattern. Note when the smell started, whether one ear or both ears are affected, whether the dog has been swimming or bathed, and whether there are other signs, such as scratching or head shaking, and give that history to the vet.

What does discharge mean?

Discharge is any fluid, pus, or material coming from the ear, other than a small amount of normal wax on the outer ear. Discharge can be yellow, green, brown, black, bloody, watery or thick, and any discharge that is new, coloured, smelly, or present in more than a trace amount needs veterinary assessment. Discharge can indicate infection, inflammation, a foreign object, injury or a ruptured eardrum, and it needs examination, not wiping away. Do not clean discharge away to make the ear look tidy before a vet visit, do not insert anything to reach it, and do not apply a cleaner or product to it. Keep the outer ear dry, prevent scratching as far as you can, and seek veterinary advice promptly, telling the vet the colour, consistency, amount and smell of the discharge, and when it started. A vet can examine the canal safely and decide on treatment, and the discharge itself is useful diagnostic information, not dirt to be removed at home.

What does redness mean?

Redness of the ear flap, the folds, or the entrance to the canal means inflammation, irritation, allergy, infection or injury, and it needs assessment, especially if it is new, one sided, spreading, or accompanied by swelling, heat, pain or discharge. Mild redness after vigorous cleaning can be caused by the cleaning itself, which is why gentle cleaning and a pre cleaning check matter, but redness found on a check, before any cleaning, is a warning sign, not a cleaning effect. Do not clean a red ear, do not apply a cream, oil or home remedy, and do not try to cool it with water or ice. Note whether the redness is on one ear or both, whether the ear is hot or swollen, whether the dog is scratching or shaking its head, and whether there has been a change in diet, environment, bathing or products. That history helps the vet judge whether the problem is local to the ear or part of a wider skin or allergy problem.

What other signs go with smell, discharge and redness?

Other signs that go with these warnings include swelling, heat, pain, tenderness, sores, lumps, crusting, hair loss around the ear, head shaking, scratching, head tilt, loss of balance, whining, growling when the ear is touched, and a change in behaviour such as reluctance to eat, play or be handled. Any of these signs, alone or together, strengthens the need for prompt veterinary assessment. A dog that shakes its head constantly, holds its head tilted, or shows balance problems needs urgent veterinary advice, as Lesson 10 explains, because those signs can indicate a deeper ear problem. Do not wait for several signs to appear before seeking help. One clear warning sign, such as discharge or a strong smell, is enough to refer, and early referral gives the vet the best chance to treat the ear before it worsens.

Use this referral checklist when you find a warning sign:

1. Stop cleaning, do not insert anything, do not apply a product.
2. Note smell, discharge colour and amount, redness, swelling, heat and pain.
3. Note which ear, when it started, and any other signs such as shaking or scratching.
4. Keep the ear dry, keep the dog comfortable, prevent scratching if you can.
5. Seek veterinary advice promptly, giving the full history.
6. Follow vet directions, and do not resume home cleaning until the vet advises it.

Stop and get help: what if the ear looks worse quickly?

If an ear looks worse quickly, with increasing redness, swelling, discharge, pain, bleeding, head tilt or balance problems, seek urgent veterinary advice, rather than waiting for a routine appointment. Tell the vet the signs are worsening and how quickly, and follow the vet guidance on urgency and care while waiting. Do not clean, flush or treat the ear while waiting, unless the vet directs you to, because the wrong action can worsen a deteriorating ear. Smell, discharge and redness are the ear way of asking for professional help, and answering promptly, with a clear history and no home interference, is the most protective thing an owner can do. Home ear care earns its value by recognising these signs early and referring them quickly, not by trying to treat them.

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