Why is my dog's undercoat coming out so heavily?
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Overview
If your dog's undercoat is coming out heavily, the most common reason is a normal coat shed, especially in spring and autumn. It can also happen if the coat has been holding onto loose hair, or if skin or coat care needs a bit of attention. If the shedding seems sudden, patchy, itchy or linked with sore skin, it is worth looking a little closer.
Things To Check
1. Check whether the shedding is seasonal or has started after a change in temperature, daylight or routine.
2. Look for itching, scratching, rubbing, licking or biting at the coat, as these can suggest the skin is uncomfortable.
3. Part the coat and check for redness, flakes, scabs, soreness, bald patches or a greasy feel.
4. See whether the coat has recently been washed less often, brushed less often, or has had more mud, moisture or debris trapped in it.
5. Check for changes in appetite, energy or weight, especially if the coat condition has changed as well.
6. Look at whether the hair is coming out evenly all over, or in patches that may suggest a skin problem.
7. Consider whether your dog has started a new diet, grooming product or parasite treatment recently, as changes can sometimes affect coat condition.
Common Causes
The most common cause is normal seasonal shedding, when the dog naturally loses a lot of undercoat to make room for a new coat. This can look dramatic, especially in double-coated breeds.
Another common reason is that loose undercoat has built up over time, so once grooming starts it comes out in big amounts all at once.
Dry skin, a greasy coat, or a coat that is not being brushed through regularly can also make shedding seem heavier than usual.
Less commonly, excessive shedding can be linked with skin irritation, parasites, allergies or other health issues that affect coat condition. These are more likely if there is itching, bald patches, redness or a noticeable change in your dog's behaviour or general health.
What To Do
Start by increasing gentle grooming for a short period so you can remove loose hair before it ends up around the house. Use a calm, steady routine and avoid over-brushing, which can irritate the skin.
Keep an eye on the skin underneath the coat. If it looks healthy and your dog is otherwise well, the shedding may simply be part of a seasonal coat change.
Make sure your dog is getting regular exercise, a balanced diet and sensible parasite control, as general coat health often reflects overall care.
If the coat is very dirty, greasy or full of loose undercoat, a wash with a suitable dog shampoo may help support coat care as part of your grooming routine.
If the shedding is patchy, the skin looks sore, or your dog seems uncomfortable, contact your vet for advice.
Products That May Help
If your dog's undercoat is shedding heavily, a good grooming routine can help you manage loose hair and keep an eye on the skin at the same time.
Related Questions
Is heavy undercoat shedding normal in double-coated dogs?
How often should I brush my dog during shedding season?
When should shedding be checked by a vet?
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.