Used to describe a specific horse coat pattern, not just any coloration. They admired the unique pattern of the dapple grey, distinguishing it from solid-colored horses.
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Not Breed Specific
'Dapple grey' describes coat color and pattern, not the breed of the horse. Regardless of breed, any horse can be a dapple-grey if its coat matches the description.
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Changing with Age
Horses can change from dapple grey to a solid grey as they age. The dapple grey mare had fewer spots now, showing her age through her changing coat.