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Grullo Horse Color

Grullo horse color picture

Grullo horse color can be compared to the color of a mouse (or smoke). They are often referred to as grullos. Although you would often describe the color of a mouse as “gray,” a grullo horse is by no means a gray horse!

The grullo shade is devoid of any graying gene and you can very well expect this shade to top any consistency test. While it may slightly vary during summer and winter, the color doesn’t really pale or grow lighter as the horse ages. It also remains uniform throughout each individual strand of hair. If you dislike the clump of light and dark horse hairs of roan horses, you’re surely going to like grullo horses a lot!

Some Varying Shades of Grullo

In addition to smoke and mousey gray, there are some interesting (and informal) names you can use to describe the distinct shades of grullo.
  • Black dun
  • Silver dun
  • Blue dun
  • Silver grullo
  • Lobo dun
  • Slate grullo
These shades are basically alike from a genetic perspective, since any black gene topped by a dun gene produces grullo horse color.

The Name in Other Tongues

Pronounced as “grew-yo” (or “ya”), the term grullo has Spanish origins and literally means a cane with a slate-gray color. Following the Spanish naming conventions, there’s nothing weird if you call a female grullo (the mare) a “grulla” and its male counterpart (the stallion) a “grullo.”

In Norwegian tongue, the color is called "grâblakk" or "grâ" for short. Either term literally means “gray dun.” Often, many people confusingly call a grullo-colored Norwegian Fjord Horse a “gray.”

The Average Joe

The typical grullo horse has only one uniform shade in a single hair strand, dark lower legs, some dorsal stripes and distinctly smoky-colored shoulders. Apart from these, you’ll know a grullo when you see one. Just pay attention to the following primitive markings:

PartAppearance, Markings
BodyMottled
Dorsal/BackDark, with diagonal stripes
EarsBarred or striped, dark at the tips or edges
EyesSurrounded by a cob web pattern
FaceDark, with a cob web pattern on the forehead
Lower legsBarred or marked with dark tiger stripes
Mane and tail hairsDark and long
NeckDark with a “shadowing” effect


Unlike the classic bay and red duns, the grullo horse is quite rare. Would you believe that grullos make up less than 1 percent (0.7 to be exact) of the horse population registered with the American Quarter Horse Association?

Talk about rare breeds, indeed!

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