Why is my dog’s coat coming out in small round patches?
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Overview
Small round patches of missing coat can be caused by several things, and ringworm is one possible reason. It can also be due to rubbing, mites, allergies, bacterial skin issues, or over-grooming. The shape of the patch gives a clue, but you can’t confirm the cause just by looking.
Things To Check
1. Look at the patch shape and edges. Ringworm often causes round or ring-like areas of hair loss, but other skin problems can look similar.
2. Check whether the skin is red, flaky, crusty, or has broken hairs. These details can help narrow down what’s going on.
3. See if your dog is itchy, licking, chewing, or rubbing the area. Strong itchiness can point towards several other causes as well as skin irritation.
4. Notice whether the patches are spreading or appearing in more than one place. A changing pattern is worth keeping an eye on.
5. Think about recent contact with other animals, boarding, grooming, or visits to parks and kennels. Skin problems can sometimes be picked up through close contact or shared spaces.
6. Check other pets or people in the home for similar skin changes, especially if the patch looks dry, scaly or circular.
7. Look for any recent changes in diet, washing routine, bedding, grooming products, or flea control, as these can sometimes be part of the picture.
Common Causes
Ringworm is a common cause of round patches of hair loss. Despite the name, it’s a fungal skin infection rather than a worm. It can cause broken hairs, scaling and patchy coat loss.
Allergies or skin irritation can also lead to patchy hair loss, especially if your dog has been scratching or licking. This may leave the coat looking thin or uneven in spots.
Mites or other parasitic skin problems can create patchy hair loss too, sometimes with itching, redness or crusting.
Rubbing, pressure points, over-grooming or minor trauma can sometimes leave small bald patches that look similar at first glance.
What To Do
Keep a close eye on whether the patches are changing over a few days. Taking a clear photo can help you track whether they’re spreading or improving.
Avoid using human creams, scented washes or home remedies on the area, as these can irritate the skin or make things harder to assess.
Wash your hands after handling the area and avoid close contact with the patch until you’ve had advice, especially if ringworm might be involved.
Keep bedding, brushes and shared surfaces clean, and don’t share grooming tools between pets until you know what’s causing the hair loss.
If your dog is itchy or the skin looks sore, try to prevent licking or scratching as much as possible, since that can make the patch worse.
When To Contact A Vet
Speak to your vet if the patches are spreading, your dog seems itchy or uncomfortable, the skin is becoming red or crusted, or other pets or people in the home are developing similar signs. Ringworm and other skin problems usually need the right diagnosis before you can manage them properly.
You should also contact your vet sooner if your dog is a puppy, elderly, unwell, or has a weakened immune system.
Products That May Help
Helpful grooming and wash routines can support day-to-day coat and skin care while you’re keeping an eye on patchy hair loss and waiting for advice.
Related Questions
Can ringworm in dogs spread to people?
Why is my dog losing hair in one spot?
How can I tell if a skin patch is ringworm?
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.