Which Cheval breeds come in Grisonnement?

Club breed standards describe Grisonnement for the Criollo et Tennessee Walking Horse.

Cheval pattern

Grisonnement

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

32 Cheval breeds list Grisonnement. It is in a club standard for 2 breeds.

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

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