By Jon Conklin • Updated • 6 to 8 min read
Grullo and grulla usually refer to the same dun on black coat color. Here is a fast ID checklist, the primitive markings to look for, the common lookalikes, and the simple genetics behind the color.
Quick definition: A grullo (also spelled grulla) is a horse with a black base coat modified by the dun gene, which lightens the body toward slate or smoky mouse gray while keeping black points and typical primitive markings.
Most of the time, yes. People use grullo and grulla for the same dun on black color. Some use grulla to refer to a mare, but in everyday use the spelling difference usually does not change the meaning.
A true grullo is a black base coat modified by the dun gene. That combo pulls the body color toward slate or smoky mouse gray, while keeping black points. The dun gene also tends to bring the primitive markings people look for.
Most missed clicks happen because people are trying to answer one question fast: is this grullo or something else. Here are the usual suspects:
Primitive markings can vary, but most true grullos show several of these:
Think of it as a two step recipe. First, the horse has a black base. Second, the horse inherits the dun gene, which lightens the body while keeping black points and adding primitive markings. Other genes can influence how clean the contrast looks, but that black base plus dun is the core.
Sweat leaves haze on smoky coats. Rinse after work and brush once dry to keep the body color looking even.
Black mane, tail, and legs are the frame. Keep them clean and untangled so the contrast reads on camera and in the alleyway.
Harsh detergents flatten the look. A steady curry and soft brush routine builds a healthier sheen that still looks natural.
Primitive markings live on legs. Keep cannons and pasterns clean and comfortable so the barring stays visible and the horse stays willing.
Sensation free post work care that keeps recovery calm so bodies stay willing through long weeks.
Shop the liniment gelTargeted support for high motion areas after hard stops, turns, and long haul days. Use as labeled.
Explore MasterMudd™Barrier supporting skin care that stays put on cannons and pasterns when legs need to look clean and feel good.
Learn about SilverHoofNote: Follow label directions. Avoid applying topical products near eyes. Check your association rules when needed.
If you have a photo and you are trying to call the color correctly, send it through the contact page. We will keep it simple and useful.
Most of the time, yes. People use grullo and grulla for the same dun on black color. Some use grulla to refer to a mare, but in everyday use the spelling difference usually does not change the meaning.
No. Gray is a pattern that progressively lightens a horse with age. Grullo is a stable color created by dun dilution on a black base, so it does not keep turning lighter year after year the way gray does.
Most true grullos show a dorsal stripe and often leg barring. Many also show shoulder shadow, darker ear tips, and other primitive markings, along with black mane, tail, and lower legs.
A black base coat plus the dun gene. The dun gene lightens the body while keeping black points and producing primitive markings.
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