Why does my dog have brittle hair and broken coat shafts?
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Read time: 3 minutes
Overview
Brittle hair and broken coat shafts can happen for several reasons, and lice are one possible cause. It can also be down to scratching, coat damage, poor coat condition, skin irritation or other parasites, so it’s worth checking the coat closely rather than assuming it’s just a grooming issue.
Things To Check
1. Part the coat and look for tiny moving insects, pale eggs attached to the hair, or areas where the coat looks patchy and rough.
2. Check whether your dog is scratching, biting, rubbing or licking more than usual.
3. Look for dandruff, scabs, redness, broken skin or sore spots on the neck, back, rump and behind the ears.
4. Think about whether the coat has been tangled, over-brushed, clipped too short or exposed to harsh shampooing.
5. Notice whether the hair is brittle all over or only in one area, as local damage can point to rubbing or friction.
6. Check other pets in the home for similar coat changes or itching.
7. Look at your dog’s bedding, grooming tools and favourite resting places for signs of dirt, fleas, lice or general build-up.
Common Causes
Lice are one of the more direct reasons a coat can look rough, broken or unhealthy, especially if your dog is itchy and the hair is damaged from scratching.
Friction from collars, harnesses, bedding or constant rubbing can break the coat shafts in one area and make the hair look brittle.
Over-grooming, harsh brushing or frequent washing with unsuitable products can sometimes leave the coat dry and more prone to breakage.
Skin irritation, allergies and other external parasites can also lead to scratching and hair damage, even if lice aren’t the only issue.
Less commonly, poor coat condition can be linked with an underlying health problem, so ongoing coat changes should not be ignored if they don’t settle.
What To Do
Start by keeping the coat clean, dry and gently groomed. Use a soft brush and avoid pulling through tangles, as that can worsen breakage.
Wash bedding, vacuum resting areas and keep an eye on any other pets, since coat-related parasites and irritation can affect more than one animal in the household.
If the coat looks dry or damaged, keep grooming simple for a while and avoid changing lots of products at once. That makes it easier to tell whether things are improving.
Take a few photos over several days if the change is ongoing. It can help you judge whether the coat is getting better or worse.
When To Contact A Vet
Speak to your vet if the hair loss or breakage is getting worse, your dog is very itchy, the skin is sore or infected-looking, or you suspect lice and aren’t sure how to manage it safely. Ongoing coat damage can sometimes sit alongside another skin or health issue that needs proper treatment.
Products That May Help
Helpful grooming and coat-care products can support your dog's routine while you monitor the coat, check for skin changes and keep grooming gentle.
Related Questions
How can I tell if my dog has lice?
Why is my dog scratching but I can’t see fleas?
Can poor coat condition be linked to skin irritation?
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.