Why does my dog keep scratching one ear and developing skin sores?
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Overview
If your dog keeps scratching one ear and then develops a sore patch, it’s often because something is irritating that side and the scratching is making the skin worse. Common causes include ear irritation, an ear infection, mites, allergies, trapped moisture, a small injury or a hot spot that’s been made worse by rubbing.
It’s worth checking the ear and the skin around it carefully, because the sore may be the result of repeated scratching rather than the original problem itself.
Things To Check
1. See whether the scratching starts after walks, grooming, swimming, bathing or time outdoors.
2. Look at the ear flap and the skin around it for redness, scabs, broken skin, swelling, discharge or a bad smell.
3. Check whether your dog is shaking their head, holding the ear differently, or seeming sore when the ear is touched.
4. Look for signs of fleas, mites or other skin irritation on the head, neck, belly and base of the tail.
5. Note whether the sore is getting bigger, weepy, crusty or more uncomfortable over a day or two.
6. Check if there’s anything obvious causing rubbing, such as a collar, harness strap, grooming product or plant material.
7. Think about whether your dog has a history of allergies, sensitive skin or recurring ear trouble.
Common Causes
The most common reason is local irritation that leads to a scratch cycle. That might be due to a mild ear problem, trapped moisture, allergies or a small foreign body.
Ear infections can also make one ear very itchy and uncomfortable, which often leads to scratching and skin damage around the ear.
Parasites such as mites or fleas can sometimes cause focused itching, even if the rest of the coat looks fairly normal.
In some dogs, repeated scratching creates a hot spot, where the skin becomes inflamed, sore and more likely to keep being rubbed.
Less commonly, a small wound, bite or skin issue elsewhere on the ear can be the starting point.
What To Do
Try to stop the scratching from continuing, because more rubbing usually means more skin damage. Keep the area clean and dry, and avoid using human creams or ear drops unless your vet has told you to.
If the ear looks dirty, smelly, swollen or very sore, it’s sensible to arrange a vet check, as ear problems often need the right treatment rather than just surface care.
Take a simple photo each day so you can judge whether the sore is improving or worsening. If your dog wears a collar or harness that seems to rub the area, check the fit and see whether anything is irritating the skin.
For dogs with recurring skin or ear issues, a steady grooming and washing routine may help support comfort and keep the coat and surrounding skin cleaner between flare-ups.
Products That May Help
If your dog has skin or ear irritation, a gentle home care routine can be useful alongside veterinary advice when needed. The arlo.® Pet Care collection may help support regular grooming and washing routines.
Related Questions
Could my dog’s ear scratching be caused by mites?
Why does my dog shake their head and scratch one ear?
How can I clean my dog’s ears safely at home?
Atlas is here to support owners with practical, easy-to-understand guidance. It is not a substitute for professional veterinary advice. If you're concerned about your animal's health, symptoms worsen, or something doesn't feel right, contact your vet.