Misty Mills

Misty Mills was born in 2006. Her sire was the half Arabian chestnut tobiano Courtney's Boy and she looks a good bit like him. She's the last foal of the prolific bay tobiano mare Goose, registered name Sweet Mischief and/or Twirling Lace (it's complicated). She's a half sister to the late Merry Teapot's High Bid, Slash of White, and off island stallion Calico Kid. None of her foals have been kept for the herd on Assateague.
https://www.thecolorfulchincoteague.com/arabian.html

Misty Mills is a bright red chestnut, much like her sire. Her dam was bay but she carried chestnut recessively and provided the other copy of red. Chestnuts can have some white hairs mixed very lightly into their coat. It's just something that happens sometimes and she has this.
https://www.thecolorfulchincoteague.com/chestnut.html

I have no idea if Misty Mills carries the bay causing agouti. Her bay dam could have passed it to her. Her sire could have also as he appeared to carry it based on his foals. All but one of Misty Mills's foals have been sired by a chestnut (the only outlier a bay by a bay) so without testing I don't have any info to go on.
https://www.thecolorfulchincoteague.com/bay.html

Both of Misty Mills's parents were tobiano pinto and she inherited one copy from one of them. She's had five solid colored foals and that tells us she is heterozygous for tobiano. I think she has another white pattern and I think her sire did too, but no way to tell for sure without testing.
https://www.thecolorfulchincoteague.com/tobiano.html

Misty Mills's probable genetic makeup: e/e, TO/n