Why does my dog have a crusty sore patch that won’t dry up?
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Overview
A crusty sore patch that won’t dry up is often a hot spot, but it can also be caused by other skin irritation, licking, scratching, allergies or a small wound that’s been kept moist. You can usually check a few simple things at home first, then decide if it needs veterinary attention.
Things To Check
1. Check where the patch is and whether your dog can lick, scratch or rub it easily.
2. Look for redness, swelling, heat, discharge, a bad smell or broken skin.
3. See if the area looks moist, sticky or crusted over rather than clean and dry.
4. Notice whether your dog seems itchy, sore or bothered when the area is touched.
5. Think about recent triggers such as swimming, rain, muddy walks, grooming, clipping or a new shampoo.
6. Check for fleas, insect bites or signs that your dog has been scratching more than usual.
7. Look at whether the patch is spreading, recurring or taking more than a few days to improve.
Common Causes
Hot spots are one of the most common reasons for a crusty, wet-looking sore patch in dogs. They often start when the skin gets irritated and the dog keeps licking or scratching it.
Other common causes include allergies, flea irritation, minor skin trauma, trapped moisture in the coat, or a patch that’s been rubbed by a collar, harness or rough brushing.
Less commonly, a skin infection or another underlying health issue may be involved, especially if the area keeps returning or is slow to settle.
What To Do
Try to stop your dog licking, biting or scratching the patch while you monitor it. Keep the area clean and dry, and avoid using harsh products, household creams or anything that could sting the skin.
If the coat around the area is long and likely to hold moisture, gentle grooming around it may help you keep an eye on changes. Keep a note of when it first appeared, whether it’s getting larger, and anything that seems to make it worse.
If the patch is linked to walks, swimming or wet weather, drying your dog thoroughly after exercise or washing may help reduce ongoing irritation.
When To Contact A Vet
Speak to your vet if the sore patch is spreading, very painful, smelly, oozing, or not improving after a short period of sensible home care. You should also get advice sooner if your dog seems unwell, keeps making the area worse, or the skin breaks down quickly.
Products That May Help
If your dog has a sore, crusty patch, a simple grooming and washing routine can be useful as part of keeping the area clean and monitoring changes. arlo.® Pet Care may help support day-to-day coat, skin, paw and ear care.
Related Questions
Why does my dog keep licking one sore spot?
Could a crusty patch on my dog be a hot spot?
When should I let my vet look at a skin sore?
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.