Dry and flaky skin in dogs: where to start and when to worry?

Reading time: about 7 min

When white flakes start falling from a dog’s coat, the first thought is often simple: the skin must be dry and need moisturising. Sometimes the explanation is ordinary — dry indoor air, an unsuitable shampoo or a change in grooming. At other times, flaking is the first visible sign of something else. I like the iceberg comparison also used by integrative veterinarians: what we see on the coat may not reveal the whole problem. I would only add that not every iceberg hides a serious disease.

I would therefore start with observation, rather than a pile of supplements or the conclusion that the dog has an allergy. Is the skin only flaky, or also red, greasy and itchy? Is the problem everywhere, or just on the back, belly or paws? And when did it actually begin?

Dandruff is a sign, not a diagnosis

The outer skin layer renews itself continuously. Changes in that process can allow dead cells to collect as visible flakes. Veterinary medicine uses the term seborrhoea for this scaling, sometimes greasy skin. In most cases it is secondary to another problem rather than an independent inherited skin disease. Allergic inflammation, yeast or bacterial overgrowth, parasites, hormonal disease or damage to the skin barrier may be involved.

Dry skin and flaky skin are not always the same thing. Skin can be dry, rough and tight, but flaking can also occur with a greasy coat and unpleasant smell. In that situation, adding a greasy mask may be the last thing the skin needs. Redness, itch, hair loss or small crusts make this more than a cosmetic issue.

Which possible causes should we consider?

First, review recent changes. Has the dog been washed more often, had a different shampoo, been dried with very hot air or begun sleeping beside a radiator? Has the diet changed? Is there a new medicine or another health problem? Even avoiding brushing because an area hurts can eventually affect the coat.

The next big question is itch. Scratching, chewing paws or rubbing the face can involve fleas, mites, allergies, bacterial infection or Malassezia yeast. If the dog barely itches but scaling spreads and hair thins, the veterinarian considers other skin diseases and possible hormonal causes too. Hypothyroidism, for example, can affect the coat, but dandruff alone is not enough to suspect that diagnosis.

Finding the cause sometimes requires fairly simple tests: examining skin and hair, a skin scraping for parasites, microscopy of a skin sample or testing for fungal disease. Recurrent inflammation, weight changes, lethargy or other general signs may justify blood tests. I would not order every possible test for mild dandruff, but neither would I leave a persistent problem to endless home experiments.

How much does skin health depend on nutrition?

Normal skin renewal requires protein, essential fatty acids, vitamins and minerals. A balanced diet matters, but not every dog with dandruff has a deficiency. Certain deficiencies are less likely with a complete, balanced dog food than with an unbalanced homemade menu. Individual needs, absorption and disease-related metabolic changes may still play a role.

Fatty acids deserve particular attention. The skin barrier needs linoleic acid, an omega-6 fatty acid. It is therefore wrong to call omega-6 the enemy of skin and assume less is always better. The omega-3 fatty acids EPA and DHA may help some inflammatory skin conditions and have been studied in dogs with atopic dermatitis. Research does not show that fish oil fixes every skin disease or replaces targeted treatment.

The omega-6 to omega-3 ratio matters, and integrative veterinary nutrition often discusses approximately 5:1 or lower as a target. Canine skin studies have also used ratios close to this, such as 5.5:1. This does not establish a universal upper limit for every dog, but gives the ratio a reasonable place in dietary assessment. A ratio alone still cannot tell us how many milligrams of the relevant fatty acids the dog receives. Amount, form, dietary energy and the whole menu also matter. Check a fish oil label for EPA and DHA, not only the large “milligrams of fish oil” figure. More is not automatically better; discuss dosing particularly when other diseases or medicines are involved.

Integrative nutrition often emphasises fresh foods and varied fatty-acid sources. That idea need not be dismissed, but we must understand what each addition contributes. A sardine can supply marine fatty acids, for instance, while its portion must fit the whole diet and energy needs. If yeast is also overgrowing on the skin, even the best-chosen fish may not resolve that alone.

Can washing and brushing help?

Sometimes they can. Regular brushing removes loose hair and dead cells and gives you a closer look at the skin. Redness or scaling may hide beneath an apparently tidy coat, especially with a thick undercoat. But “brush exactly once a week” is not a rule for every breed or coat type. Some need more, some much less. Faddy can go weeks without brushing without it visibly affecting or bothering him. With Oscar, however, I have noticed less itching and better overall skin condition when I brush consistently every day.

Washing is similar. A muddy dog needs a bath for a different reason from a dog prescribed a medicated shampoo by a dermatologist. Harsh or unsuitable cleansers can dry the skin, while correctly chosen, appropriately frequent washing may help inflamed or very greasy skin. I would neither avoid washing on principle nor wash simply by the calendar. I would choose a suitable product, rinse thoroughly and consider the skin’s condition.

If the dog constantly sleeps near a heater and winter air is very dry, reviewing room humidity and the sleeping spot is a sensible small step. Sufficient omega-3 does not make the effects of dry air impossible. Skin does not live independently of the surrounding environment.

Coconut oil, plant products and the skin barrier

Coconut oil is often suggested for dry skin. A small amount may help soften an otherwise healthy dry patch, and integrative practice uses various oils for moisturising. Topical and oral coconut oil need separate assessment: experience with one route does not prove the effects of the other. There are currently insufficient high-quality comparative canine studies to treat either as a cure for the cause of seborrhoea, allergy or yeast problems. Topical oil is not automatically suitable everywhere either. On wet, infected or hot areas, an extra layer can complicate care, and the dog may lick it off.

I would therefore not routinely recommend a fixed oral amount of coconut oil for dandruff. That overlooks fat, calories, digestive tolerance and the actual diagnosis. I value the integrative aim of supporting normal skin function, but every product must face the same questions: does it help this problem, and is it safe? “Natural” alone answers neither.

When is home care not enough?

See a veterinarian if skin is very red, smells, oozes, the dog scratches enough to wound themselves or hair falls out in patches. The same applies to sudden widespread flaking, recurrence despite changes, or accompanying lethargy, weight changes or other general concerns. Sudden facial swelling, breathing difficulty or rapidly worsening overall condition needs urgent help.

For mild problems, observe for a few days, use gentler care and document changes. Photos in the same light help distinguish improvement from flakes simply being less visible that day. If inflammation keeps increasing, I would not wait for yet another oil or new food to “start working”.

Skin health involves the whole dog, but that does not mean every problem starts with diet. Sometimes a more suitable shampoo is enough; sometimes parasites, infection or hormonal disease need attention. Learning to distinguish the cause from supportive care is especially valuable to me.

FendaF’s practical suggestion. Before adding another oil or supplement, examine three places: the back, belly and between the paws. Note whether there are only dry flakes or also redness, smell, grease, itch and hair loss. Review cleansers and grooming, but avoid adding several new products together. Inflamed skin, severe itch or persistent changes deserve a veterinary examination.

If scratching has caused a small superficial wound, gentle cleaning and wound care become a separate concern; deep or inflamed wounds need veterinary assessment.

Sources

Merck Veterinary Manual. Seborrhea in Animals.

Merck Veterinary Manual. Seborrhea in Dogs.

Magalhães TR et al. (2021). Therapeutic Effect of EPA/DHA Supplementation in Neoplastic and Non-neoplastic Companion Animal Diseases: A Systematic Review.

van Amersfort K, van der Lee A, Hagen-Plantinga E. (2023). Evidence-base for the beneficial effect of nutraceuticals in canine dermatological immune-mediated inflammatory diseases — A literature review.

WSAVA Global Nutrition Committee. Global Nutrition Resources.

Effect of an omega-3/omega-6 fatty acid-containing commercial lamb and rice diet on pruritus in atopic dogs: results of a single-blinded study.