What should I check if my dog has a hot spot under thick fur?
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Overview
If your dog has a hot spot under thick fur, the first things to check are the skin itself, the size of the irritated patch, and whether your dog is licking, scratching or rubbing the area. Hot spots can look much smaller on the surface than they are under the coat, so parting the fur carefully is often the best way to see what's going on.
There can be several reasons for a sore, moist or red patch under thick fur, including itching, damp coat, friction or a minor skin irritation. You usually can't tell the exact cause from looking alone, but you can check for signs that help decide how urgent it is.
Things To Check
1. Part the fur gently and check the skin directly, not just the coat surface, for redness, moisture, swelling or broken skin.
2. Look for discharge, scabs, a bad smell or matted fur, as these can make the area harder to keep clean and may suggest the spot is getting worse.
3. Check whether your dog is licking, chewing, scratching or rubbing the area more than usual, especially after walks, swimming or grooming.
4. Feel around the patch for heat, tenderness or puffiness, but stop if your dog reacts strongly or seems painful.
5. Think about any recent trigger, such as wet weather, bathing, clipping, collar rubbing, itching from something in the environment or fleas.
6. Check whether the patch is growing, becoming more damp or starting to spread into nearby fur.
7. Make a note of any changes in your dog's behaviour, sleep or comfort level, as that can help you judge whether the irritation is settling or worsening.
Common Causes
The most common causes are self-trauma from licking or scratching, moisture trapped in the coat, and friction from thick fur, collars or harnesses. These can all create the warm, sore conditions that let a hot spot develop.
Sometimes a hot spot starts after an itch trigger such as fleas, pollen, grooming irritation or a minor skin allergy. Less commonly, an underlying ear, skin or anal discomfort can lead to repeated scratching or licking of one area.
What To Do
Part the fur carefully so you can see the skin and keep an eye on whether the area is changing. If the coat is very matted around the sore patch, avoid pulling at it, as that can make the skin more uncomfortable.
Keep the area as clean and dry as you reasonably can, and stop your dog from repeatedly licking or scratching if you can do so safely. If the skin looks very sore, is spreading, smells bad, or your dog seems uncomfortable, it's sensible to contact your vet for advice.
It can also help to think about what might have started the irritation, such as damp coat, a harness rubbing, or another itch trigger, so you can reduce repeat irritation once the skin has settled.
Related Questions
How do I tell a hot spot from a minor skin irritation?
Should I trim fur around a hot spot at home?
Why does my dog keep licking one spot on the skin?
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.