Dog Scratching Ear and Shaking Head: How to Tell Ear Infection vs Ear Mites vs Simple Dirt

Ear scratching and head shaking are common—but they’re not always “just dirt.” Use this practical, vet-aligned checklist to spot red flags for otitis (ear infection), ear mites, foreign material, or simple wax buildup, +

TL;DR

• Head shaking + ear scratching often point to otitis (ear canal inflammation/infection), ear mites, allergies, moisture, or a foreign object—not just wax. (merckvetmanual.com)
• Ear mites cause intense itch plus dark, waxy/crusty debris; diagnosis is typically by otoscope and/or microscope. (vcahospitals.com)
• If the ear is red, painful, has a bad odor or discharge, don’t “deep clean” at home—call your vet. (petmd.com)
• Avoid cotton swabs/Q-tips in the canal; they can push debris deeper and can injure the ear. (petmd.com)
• Use only dog-specific ear cleaners; avoid household items like alcohol or hydrogen peroxide. (petmd.com)

Why dogs scratch their ears and shake their heads

A dog scratching an ear and shaking their head is basically saying: “Something in here feels wrong.” Sometimes it is simple wax buildup. But it can also be otitis externa (inflammation of the external ear canal), ear mites, allergies, trapped moisture after bathing/swimming, or a foreign object (like plant material). (merckvetmanual.com)

Otitis externa is common in dogs and often shows up as head shaking, itchiness, pain, bad odor, redness, and discharge. (merckvetmanual.com)

A 60-second at-home check (safe, no tools)

1. Compare both ears. Is only one ear involved, or both? Sudden one-sided symptoms can be with something in there; both sides can be with allergies or mites (but there are exceptions).
2. Look, don’t probe. Lift the flap, and look at what’s right in there. The color, possible swelling, crusts, how dirty or much wax in there.
3. Close to your nose. Smell, it shouldn’t smell of much. When it is bad, yeasty, a common infection indicator (check for probable cause if obvious, but if not a vet is your best shot) (petmd.com).
4. Tactile at the base of the ear (outside), if your dog jerks away, yelps, growls, whines assume pain and walk away. Pain should out you and indicate a serious red flag for infection and/or deep infection (merckvetmanual.com).
5. Check for “whole-dog” red flags: Head tipped at a crazy odd angle, walking into walls or other objects falling or pinching its butt and acting out of it’s mind. Assuming one can and/or should do just that, better to get the whole dog into the vet (akc.org).

Otitis or bayou swamp? You can’t know. We let them describe it with an otoscope and usually take a microscope to check the debris.

Checklist: Dirt vs Otitis vs Ear Mites

When to skip cleaning and call the vet

• The ear is red, inflamed, or painful (your dog won’t let you touch it). (vcahospitals.com)
• There’s a bad odor or any discharge (especially wet, yellow/tan, bloody, or pus-like). (petmd.com)
• Your dog has a head tilt, loss of balance/coordination, vomiting, or seems disoriented. (akc.org)
• The ear flap is swollen, like a “pillow” (possible aural hematoma due to vigorous shaking/scratching). (vcahospitals.com)
• Symptoms last longer than 24–48 hours, keep coming back, or your dog has known allergies/skin conditions (often a reason for repeat ear issues). (merckvetmanual.com)

If it really is “just dirty”: here’s how you can clean dog ears at home safely

Only clean at home if the ear seems generally normal (pink, not swollen), if your dog isn’t painful, and if there’s no strong smell or active discharge. Over-cleaning may irritate the canal and just worsen things. (vcahospitals.com)

What you need

• Dog-specific ear-cleaning solution (ask your vet what’s suitable for your dog). (petmd.com)
• Cotton balls or gauze (and not cotton swabs). (vcahospitals.com)
• A towel (your dog’ll shake).
• Treats (to make it easier to handle them next time).

Step-by-step cleaning (outer ear + flush, no probing)

1. Get your pup set up somewhere easy to wipe down, while keeping that towel handy.
2. Pull the ear flap up and back to straighten the canal as much as you can.
3. Squeeze droplets of cleaner into the canal till it’s full, it’s okay if some spills out. (vcahospitals.com)
4. Massage the base of the ear for about 30 seconds, and you may hear a “squishing” sound. (vcahospitals.com) Wipe away material at the entrance/inner flap only with cotton balls or gauze. Do not push material deeper. (petmd.com)
5. Stop immediately if your dog is ever painful and call your veterinarian. (vcahospitals.com)

What not to put in your dog’s ears

• Cotton swabs/Q-tips (can push debris deeper and can injure the ear). (vcahospitals.com)
• Alcohol, hydrogen peroxide, or essential oils (can irritate/damage the canal; use veterinary-formulated products instead). (petmd.com)
• Human ear drops (never use leftover prescription drops from an older ear clinic visit; treatment depends on what the veterinary doctor finds on exam and cytology.) (merckvetmanual.com)

How your veterinarian definitively “tests” for otitis versus mites, and how this matters

In clinic, your vet often uses a combination of physical exam, otosocopic exam (looking down the canal, including the eardrum if possible), plus cytology (evaluating microscopically debris) to tell bacteria and yeast apart, and inflammation patterns, and also to spot parasites like mites, because treatment of ear infections differs depending on exact cause. (merckvetmanual.com)
If the ear is very painful, some dogs will need to be sedated just for a thorough look inside, and for cleaning to be done. (merckvetmanual.com)

More prevention, and “how to verify” I am truly doing the right thing

• Make no the min-length of otic checks on a weekly basis, just look and smell. All changes are known to be easier to treat if caught early versus tested a thickened canal for weeks! (petmd.com)
• Ask your vet to demonstrate cleaning technique once and tell you about how often you should clean your dog (some pups rarely need it; others frequently). (vcahospitals.com)
• If your dog swims frequently, talk to your vet about a drying, dog-safe product, and what post-swim routine is best—moisture is a common cause of otitis. (merckvetmanual.com)
• If recurrence continues, ask your vet about the underlying issue (often it’s allergies) and what the long-term plan is to reduce relapses. (merckvetmanual.com)
• Keep a simple record: date, which ear, odor (yes/no), color/amount of discharge, and what was different (new food, grooming, swimming, boarding). Consider bringing photos with you to your next appointment.

Common mistakes that make ear problems worse

• Cleaning when the ear is painful, red, or smelly instead of getting an exam first. (petmd.com)
• Using cotton swabs/Q-tips “to get it all out.” (vcahospitals.com)
• Using household liquids (alcohol / peroxide) that irritate its tissues. (petmd.com)
• Stopping treatment early because it “looks better” (one of the reasons things recur; mirror your vet’s directions).
• Not treating other in-contact pets when ear mites a diagnosis of ear mites occur (ask your vet about your household). (vcahospitals.com)

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