Your dog's skin and coat can offer clues about their health. Find out what a dry, dull coat can mean, which signs to look for and how diet, grooming and the right veterinary advice can help.
🕒 8 min read
A healthy coat is often a sign of a healthy dog. When something is wrong with your pooch, their coat may become dull and dry, and the skin may become red and sore with scabs. Sometimes a dull coat can be improved with lifestyle adjustments, but at other times it can be a sign of a bigger problem.
Here we'll go through what can cause a dull coat in your dog, what you can do about it and when to get it checked. Coat type and natural shedding vary, so compare changes with what is normal for your own dog.
Symptoms of an unhealthy coat
Signs of an unhealthy dog coat can include:
- Dull, dry or unusually rough fur.
- Scaly flakes of skin, like dandruff.
- An unusual smell or greasy feel.
- Red skin, scabs or areas that weep.
- Excessive itching, licking or chewing.
- Patchy hair loss or changes in coat appearance.
Flakes, odour and persistent itching can have several causes. They do not identify a deficiency or a particular illness on their own.1
Reasons for a dull coat in dogs
The skin and coat need a balanced supply of nutrients and appropriate care. Allergies, parasites, grooming problems and illness can all affect their appearance. Use the table to spot patterns and decide what to discuss with your vet.
| Possible cause | What you may notice | What to do |
|---|---|---|
| Allergies | Itching, licking or redness, sometimes with recurrent ear or skin problems. | Ask your vet about food or environmental triggers rather than changing foods repeatedly. |
| An unbalanced diet | A dull coat may occur alongside poor condition or other changes. | Review the complete diet, portions and treats with your vet. |
| Dehydration or illness | A coat change alongside reduced drinking, vomiting or low energy needs attention. | Keep fresh water available and contact your vet if your dog is unwell. |
| Grooming or shampoo | Matting, trapped loose hair or irritation after bathing. | Use a routine and dog-specific products suited to the coat and skin. |
| Parasites | Scratching, flea dirt, patchy hair loss or sore areas. | Check parasite protection and ask your vet about suitable treatment. |
| Dry weather or seasonal triggers | Changes that recur in dry conditions or particular seasons. | Note the pattern and discuss persistent irritation with your vet. |
| Skin infections | Odour, greasy or scaly skin, redness, crusts or discharge. | Arrange a veterinary examination; grooming alone may not address the cause. |
| Underlying health conditions | Hair thinning or coat changes with weight, thirst or energy changes. | Your vet may recommend tests for conditions such as hypothyroidism or Cushing’s syndrome. |
Health conditions and chronic stress can affect coat quality, while allergies can change skin oils and lead to excessive shedding. Your vet can assess the skin and the rest of your dog's health rather than judging the coat in isolation.2
Where omega supplements can help
Essential fatty acids are part of normal skin and coat nutrition. A pet omega supplement may be worth discussing with your vet where additional support is appropriate, but a dull coat does not automatically mean that omega-3 is missing from the diet. Essential fatty-acid deficiency is uncommon in dogs eating a properly formulated, complete and balanced food.3
Omega Skin & Coat, previously called Glossy Coat Omega, combines fish oil with evening primrose oil, vitamin E, biotin and zinc. It provides EPA and DHA and has twist-off capsules that can be mixed into food. Choose the serving for your pet's size and follow the label and your vet's advice.
Omega Skin & Coat
Omega 3 and 6 support for your pet's skin and coat.
- Fish oil providing EPA and DHA.
- With evening primrose oil, vitamin E, biotin and zinc.
- Twist-off capsules to mix into food.
How to inject life back into a dull coat
Sometimes a dull coat can be improved with a little TLC. Improving an unsuitable diet or grooming routine may help, while other causes need veterinary treatment. Be patient: hairs grow and shed in cycles, so changes in the coat can take time.
Check with your vet
First things first: if you are concerned about your dog's dull coat, get them checked by a vet to look for underlying health issues. This is particularly important if the skin is sore, there is hair loss, or you notice changes in appetite, thirst, weight or energy.
Hormonal conditions such as hypothyroidism can affect the skin and coat. Your vet will combine the examination and history with any appropriate tests; a coat change alone cannot confirm the diagnosis.4
If your vet is happy with your dog's health, try the additional ideas below.
Improve your dog's diet
Start with a complete, balanced food suited to your dog's life stage and medical needs. Review how much they actually eat and whether treats or extras are displacing their normal meals.
Cereals and animal by-products are not automatically poor-quality ingredients. Their names do not tell you whether the finished diet is nutritious, and a natural or grain-free label does not guarantee a better food. Quality, nutritional balance and suitability for your dog matter more.5
If you use mixers or feed a homemade or raw diet, talk to your vet or a suitably qualified veterinary nutritionist about whether the overall diet meets your dog's needs. Change food gradually unless your vet advises otherwise.
Also, keep an eye on treats. They are part of the day's food intake, rather than extras that do not count.
Consider supplements where appropriate
Omega fatty acids can support skin nutrition, and research has explored their role in coat quality. In one small, placebo-controlled study of 24 dogs with poor-quality coats, a specific EPA/DHA supplement produced clinical improvement by around two months. This does not guarantee the same result from every formulation or establish that every dull coat needs an oil supplement.6
Agree a review point with your vet rather than expecting an overnight change. Do not wait for a supplement to work if the skin is becoming sore, infected or increasingly itchy.
Check the whole diet before adding separate vitamins, zinc or several coat supplements together. More is not always better, and a balanced feeding plan is more useful than trying to correct a deficiency that has not been identified.
Ensure parasite protection is up to date
As parasites can irritate the skin, checking your dog's parasite protection is a good idea if they have a dull coat and itchy skin. The products and schedule depend on their lifestyle, age and the treatment used.
If fleas are involved, your vet may advise treating other pets and the home as well. Ask the practice which products are suitable rather than relying on bathing alone.7
Check your dog's grooming routine
Every dog is different and has different grooming needs, so this may take a bit of trial and error. As a general rule, long-haired dogs need more brushing than short-haired pooches. Regular brushing can remove loose hair and debris and help distribute natural skin oils.
Check that the shampoo and other grooming products you use are suitable for dogs. Bathing frequency depends on coat type, lifestyle and any skin treatment your vet has prescribed. If you are unsure, talk to your vet or groomer.2
Related: How to bathe your dog.
Caring for your dog's coat
Your dog's coat can be a warning sign for issues below the surface, so keep an eye on its condition. Once health problems have been assessed, review their food, grooming routine and parasite protection.
If your dog needs additional nutritional support, discuss the most suitable option with your vet and explore our supplements for pets. MultiVitality for Dogs and MultiVitality Senior offer broader nutritional support for different life stages; they are not substitutes for investigating skin disease.
Dry and dull dog coat FAQs
What are the signs of an unhealthy dog coat?
A coat may look dull or dry, shed more than usual, become greasy or develop flakes and an unusual smell. Redness, scabs, hair loss and frequent scratching suggest a skin problem as well. The combination of signs matters more than shine alone.
Why has my dog’s coat suddenly become dry and dull?
Possible causes include a change in grooming, parasites, allergies, an unsuitable diet or illness. Think about recent changes in food, shampoo, routine and parasite protection, and note any itching or changes in appetite and energy. A sudden or persistent change is worth discussing with your vet.
Can changing my dog’s food improve their coat?
It may help if the current diet is unsuitable or unbalanced. Choose a complete food appropriate for their life stage and health needs, and introduce changes gradually. If a food allergy is suspected, follow a vet-led diet trial rather than choosing a food solely because it says natural or grain-free.
Can omega-3 help a dog’s dull coat?
Omega-3 fatty acids can support skin and coat health, and small studies have found improvements with certain EPA/DHA supplements. Ask your vet whether additional omega support fits your dog’s diet and symptoms. Follow the pet product’s directions rather than giving an arbitrary human supplement dose.
How long does it take to improve a dog’s coat?
It depends on the cause, treatment and hair-growth cycle. Changes may take several weeks; one small omega-3 trial found clinical improvement by around two months. Agree a review point with your vet, and seek advice sooner if itching, soreness or other symptoms worsen.
How often should I bathe a dog with dry skin?
There is no single schedule for every dog. Coat type, lifestyle and any skin condition all matter. Use a dog-specific shampoo, rinse thoroughly and follow your vet’s instructions if a medicated product is prescribed. More frequent washing is not automatically better.
