Which Horse breeds come in Širma?

Club breed standards describe Širma for the Criollo ir Tennessee Walking Horse.

Horse pattern

Širma

Progressive whitening with age: a horse born colored turns gray and finally white, often dappled or flea-bitten on the way.

32 Horse breeds list Širma. It is in a club standard for 2 breeds.

Breed	ACCC	ABCCC	TWHBEA
Criollo	Pagal standartą (“se aceptan todos los pelajes”)	Pagal standartą (“Tordilha”)	No ruling
Tennessee Walking Horse	No ruling	No ruling	Pagal standartą (“Grey”)

How Širma can appear or change over an animal's life.