The condition of a dog's coat is one of the best indicators of their internal health. Shiny, thick and soft fur speaks of balanced nutrition, a strong immune system and overall wellbeing. Conversely, a dull, dry coat with excessive dandruff or exaggerated shedding can be telling us that something is not working properly on the inside.
Diet is, by far, the factor that most influences skin and fur health. In this guide we explain which nutrients are key, what mistakes to avoid and how to improve your dog's coat from the ground up.
Why does the coat reflect diet?
The skin is the largest organ in a dog's body and, together with the fur, uses between 25 and 30% of the proteins ingested daily. If the diet is deficient, the body prioritises vital organs and the nutrients that reach the skin and fur are the last and most scarce.
Furthermore, the skin acts as a protective barrier against external pathogens. An inadequate diet compromises this barrier, making the dog more vulnerable to infections, fungal conditions and parasites.
Key nutrients for a healthy coat
Proteins and amino acids
Fur is formed mainly from keratin, a protein. For its synthesis, the body needs specific amino acids such as methionine and cystine. A diet low in protein or with proteins of low biological quality is directly reflected in the texture and density of the coat.
Essential fatty acids (omega-3 and omega-6)
These are the most important nutrients for skin health. Omega-6 (especially linoleic acid) maintains the skin barrier and skin hydration. Omega-3 (DHA and EPA) reduces inflammation and improves coat shine. The most valuable sources are salmon oil, linseed oil and oily fish.
Vitamins A, E and biotin
Vitamin A regulates cellular renewal of the skin. Vitamin E acts as an antioxidant and protects cells from free radicals. Biotin (vitamin B7) is fundamental for fur health: its deficiency can cause excessive hair loss and loss of shine.
Zinc and copper
These are minerals directly involved in keratinisation and fur pigmentation. Zinc deficiency is a common cause of skin problems in dogs.
Signs that diet is affecting the coat
- Dull fur, without shine or softness
- Excessive dandruff (white flakes on the fur or skin)
- Exaggerated shedding outside normal moulting periods
- Dry, thickened or eczematous skin
- Loss of pigmentation (black fur turns brown or reddish)
- Brittle fur that breaks easily
These symptoms do not always have a dietary origin — they can also be due to parasites, fungal infections, environmental allergies or hormonal diseases — but diet is always the first point to review.
Dietary mistakes that damage the coat
Excess grains and carbohydrates
Diets very heavily based on grains and with little animal protein do not provide the amino acids that fur needs. Wheat and maize as primary ingredients are warning signs.
Low-quality fats or insufficient quantities
A kibble very low in fat or with fats of solely vegetable origin can result in dry skin and lifeless fur. Animal fats are more bioavailable for dogs.
Poorly balanced homemade diets
Preparing food at home without planning can generate specific deficiencies in vitamins and minerals that manifest first in the skin.
Frequent diet changes
Changing kibble too frequently can destabilise the intestinal microbiome and, with it, the absorption of nutrients that the fur needs.
How to improve the coat through diet
Opt for diets with a high proportion of animal protein
Look for kibble or food where meat protein is the first ingredient. Quality chicken, salmon, turkey, beef or lamb are good bases.
Make sure there are fatty acids in the diet
Salmon oil is one of the most effective supplements for improving the coat. It can be added directly to the bowl if the kibble does not include it in sufficient quantities.
Consider a biotin or B-vitamin supplement
Especially if the coat has deteriorated progressively. Consult your vet before supplementing.
Be consistent with the same diet
Changes in the coat take weeks to become visible. Improvement is not immediate: it may take a month or more before noticeable differences appear.
The coat as a health barometer
Caring for your dog's coat through diet is not just an aesthetic matter. It is caring for their skin, their immune system and their overall wellbeing. A well-nourished dog is noticeable at first glance.
At OnlyFresh we work with brands such as Harper and Bone, Amanova and TrovetPlus, which formulate their recipes with first-class ingredients: fresh meats, salmon oil, natural vegetables and without unnecessary additives. An investment in quality nutrition is noticeable, quite literally, in the skin.
