Why is my dog's ear red and hot?
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Overview
If your dog’s ear is red and hot, the most common reason is irritation or an ear problem such as an infection, wax build-up, allergies or something getting into the ear. It’s worth checking it promptly, because a hot ear usually means the area is inflamed and uncomfortable, even if your dog is still otherwise bright.
Things To Check
1. See whether it’s one ear or both ears that are affected.
2. Look for redness, swelling, discharge, crusting, scabs, an unpleasant smell or obvious heat.
3. Notice if your dog is scratching, rubbing, shaking their head or holding the ear differently.
4. Check whether the problem started after swimming, bathing, grooming, rolling in grass or going into long grass.
5. Think about whether your dog has had ear trouble before or has a history of skin allergies.
6. Gently look at the outer ear flap for bites, scratches, cuts or signs of a small injury.
7. Watch for changes in your dog’s behaviour, appetite or energy level that might suggest they’re feeling unwell.
Common Causes
Ear infections are a common cause of a red, hot ear. These can develop when moisture, wax or irritation build up in the ear.
Allergies are another frequent cause. Dogs with skin or food sensitivities may get inflamed, itchy ears that feel warm to the touch.
Wax build-up, trapped moisture or a foreign body such as a seed or grass awn can also make the ear look and feel hot.
Sometimes the issue is a minor skin irritation, an insect bite or a scratch to the ear flap rather than the ear canal itself.
Less commonly, a more significant ear problem or injury may be involved, especially if there’s swelling, pain or discharge.
What To Do
Keep an eye on how your dog is behaving and whether the ear is getting worse, staying the same or settling down.
Don’t put anything into the ear canal unless your vet has already advised it, as this can make things more uncomfortable if the ear is sore.
If the ear looks dirty on the outside, you can gently wipe the outer flap with a soft, damp cloth, but avoid probing inside the ear.
Try to keep the ear dry if your dog has recently been swimming or bathed, and make a note of when the redness started.
If your dog scratches a lot, try to stop them making the ear more sore while you arrange the next step.
When To Contact A Vet
Speak to your vet if the ear stays hot and red for more than a short time, if there’s discharge or a strong smell, if your dog seems painful, or if the ear is swollen. You should also get advice sooner if your dog is shaking their head a lot, scratching continuously, or if the problem keeps coming back.
Products That May Help
If your dog's ears need regular checking or gentle cleaning as part of their routine, this collection may be useful for supporting day-to-day ear and grooming care.
Related Questions
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Should I clean my dog’s ear if it looks red?
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.