Dog red, sore skin – when should I see a vet?

Updated 2026-09-30 · 1 sources

Based on: PDSA

Book a vet visit

This is not usually an emergency on its own – contact your vet if it lasts, gets worse or your dog seems unwell in any other way. Common possibilities include fleas, mites, allergic skin disease, ringworm, bacterial or yeast infections, hot spots and medication reactions.

What to do now

What you can do now

Contact your vet
Note when it started, how often it happens and what else you see
Take a photo or short video to show the vet
Keep fresh water available
Let your dog rest somewhere calm

Don't

Do not give any human medicine
Do not wait if it gets worse

What it can mean

Red, inflamed or sore skin is often called dermatitis, and skin problems can be irritating and painful.^[1] Fleas can cause itchy skin in dogs.^[1] Possible causes include mange, allergic skin disease, ringworm, bacterial infections, hot spots, yeast infections and medication reactions.

Other signs that can come with it

Rash, spots or pimples
Itchy skin
Hair loss or thinning fur
Dandruff, dry flaky skin or scabs
Oily skin
Smelly, weepy skin
Brownish or discoloured skin
Thickened skin

Possible causes

Fleas
Mange
Demodex mites
Ringworm
Allergic skin disease
Medication reactions
Bacterial infections
Hot spots
Yeast infections

What the experts say

“Fleas are a common problem in dogs. They cause itchy ; Mange is caused by the scabies mite. These tiny insects cause itchy ; Demodex mites are tiny insects ; Ringworm causes circular patches of red ; Allergic skin disease causes itchy skin and rashes ;”
— PDSA [1]

If your pet is struggling to breathe, has collapsed, is having a seizure or can't stand up: go to the nearest vet now.

Not sure how serious it is?

OkPaw asks a few quick questions about your pet and tells you in 30 seconds whether it can wait. Free on Google Play for Android.

OkPaw is on Android now – an iPhone version is on its way.

Common questions

What can red, sore skin mean in a dog?

It can be linked to fleas, mange, allergic skin disease, ringworm, bacterial infections, hot spots, yeast infections or medication reactions.

What other signs can come with sore skin?

Other signs can include a rash, spots or pimples, itching, hair loss, dandruff, oily skin, smelly or weepy skin, discoloured skin and thickened skin.

Can fleas cause skin problems in dogs?

Yes. Fleas are a common problem in dogs and cause itching.^[1]

Sources

PDSA

How this page was made: written with the help of AI from the sources below, then checked claim by claim against those sources. Urgency levels follow OkPaw’s fixed safety rules. It is guidance, not a diagnosis. How we write our pages

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