What do my Horses Dapples mean?

Your equine answers on dapples! Why do horses get dapples?

Dapples are variations in pigmentation that create a distinct pattern in a horse’s coat. Those soft, round, lighter-coloured spots are something many horse owners admire. They often appear most clearly in spring and summer, and can come and go depending on a range of factors. They’re a favourite among horse owners and photographers alike, often associated with health and vitality - but there’s more to them than just good looks. What actually causes dapples, and are they a sign of something more?

There are two main types of dapples:

• True dapples: Caused by pigment changes within the hair, more often seen in genetically dappled greys.

• Bloom dapples: Transient dapples linked to optimal health, good nutrition, and grooming.

Do Dapples Indicate Good Health?

Yes and no. While dapples are often seen in horses that are well-fed, well-groomed, and in peak condition, their presence alone isn’t a definitive health indicator. They are, however, a common visual sign of a horse in good metabolic health, with an efficient digestive system and a glossy coat - often the result of balanced nutrition, a healthy hindgut microbiome, and appropriate management.

Horses on a high-fibre, forage-rich diet that includes essential fatty acids, quality protein, vitamins (especially A and E), and trace minerals are more likely to develop dapples. Regular grooming also plays a part by stimulating circulation and promoting natural oils in the coat.

That said, some genetically predisposed horses may not show dapples even when in excellent health, while others may dapple easily regardless of their internal wellbeing. So, while dapples can be an encouraging sign, they shouldn’t be the sole metric for assessing your horse’s health.

What Causes Dapples to Appear or Disappear?

A number of factors can influence the appearance or fading of dapples:

• Diet: Horses lacking in copper, zinc, or essential fatty acids may lose dapples or fail to develop them. Adding a high-quality supplement that supports gut, coat and skin health can make a visible difference.

• Season: Many horses develop dapples during the summer months when they shed their winter coat and produce more natural oils.

• Genetics: A horse needs the right genes to dapple at all - certain coat colours and gene variants make dapples more or less likely, regardless of diet or grooming.

• Grooming: Curry combing and thorough grooming can enhance circulation and help bring out natural dapples.

Five key factors:

1. Genetics

Genetics is the first piece of the puzzle. Some horses are simply born with the predisposition to dapple. Greys, bays, and certain warmbloods or Iberian breeds are more likely to show dapples naturally. You might notice dapples in a young horse fade as they age, or appear more strongly at certain times of year.

Dapples themselves come down to how dark pigment (eumelanin) and red pigment (phaeomelanin) are distributed along individual hairs - and two specific genes play a particularly large role in this.

In grey horses, a duplication in the STX17 gene causes pigment-producing cells to gradually produce less colour with each hair growth cycle. This is why dapples often appear temporarily as a grey horse transitions towards a fully white or flea-bitten coat, and why horses carrying two copies of this gene tend to lose colour and dapples younger than those with just one copy.¹

The silver dapple gene (also known as the Z gene or PMEL17 gene) works differently. It's a dilution gene that affects black pigment (eumelanin) specifically, lightening black hairs to often produce a chocolate coat colour with a flaxen or silvery mane and tail. This gene is most visible on black-based coat colours (like black or bay), and has little to no effect on red-based coats (like chestnut) - which is also why chestnut horses, lacking meaningful eumelanin in their coat to begin with, almost never show true dapples.

¹ Source: Complex Inheritance of Melanoma and Pigmentation of Coat and Skin in Grey Horses, peer-reviewed genetics study.

2. Nutrition and Internal Health

Equine nutrition plays a huge role. Horses that are well-fed with:

• High-quality protein
• Essential fatty acids (like Omega-3s and Omega-6s including DHA and EPA)
• Key vitamins and minerals (such as copper and zinc)

are far more likely to show a dappled coat. These nutrients support skin and coat condition, metabolism, and gut health - all closely tied to outward appearance. A horse’s coat will only look its best when all other aspects of health are optimal, so ensuring you are feeding your horse a balanced diet is essential.

Natural Vitamin E is particularly important as an antioxidant, helping to protect skin cells from oxidative stress caused by environmental factors like UV rays, dust, and pollution. It is obtained predominantly from pasture and so horse's feed a hay only diet and horses in hard work are likely to require supplementation.

Ensuring well-balanced ratios of omega 3 and 6 fatty acids will also aid in regulating inflammation which is key for healthy skin and coat.

3. Gut Health

A healthy gut supports efficient digestion and absorption of nutrients, helping reflect health on the outside. Horses with a balanced gut microbiome and healthy liver function may show more dappling. Prebiotics in a quality gut balancer like Gut Food can help support gut health by feeding the hind gut microbiome, allowing them to produce more postbiotics which aid over health and vitality.

Ensure you are feeding a balanced diet. Horses need approximately 2% of their bodyweight in forage per day and this must be carefully balanced to ensure that they are getting the necessary RDA of vitamins and minerals because natural levels vary hugely depending on location and soil type/health.

Adequate forage also keeps your horse chewing which produces saliva - a natural acid buffer against gastric ulcers or EGUS. 

4. Grooming and Environment

Regular grooming promotes blood flow and spreads natural oils through the coat, contributing to a healthy coat shine and encouraging dapples to show through. Time spent in natural sunlight can also help bring out dapples, particularly in spring and summer coats.

Are Dapples Always a Sign of Health?

Not always. While dapples can indicate good equine nutrition and horse health, their absence doesn’t necessarily mean something is wrong. Some horses simply don’t dapple, no matter how well they’re cared for. However, if a horse that normally dapples suddenly loses them - or vice versa - it may signal a change in health, nutrition, or gut balance worth exploring.

Final Thoughts

Dapples are often a beautiful reward for excellent care. While genetics are outside of your control, the right feeding plan, digestive support, and grooming routine can help your horse look and feel their best. Add Equell Gut Food (or UltraMet with added vitamin E for good doers & hay only diets) to your horse’s feed to support their hindgut and digestive health for optimal vitality & shine💚