Historical Pony: Shared Impulse

Shared Impulse was a bay pinto mare born in 2004. Her sire was the chestnut tobiano Cherokee Chief and her dam was the black tobiano Paint it Black. She got her name because her four buyback donors had the "shared impulse" at the auction to buy her. Shared Impulse unfortunately had a short life as she contracted pythosis and was put down in 2009. She had three foals and none were kept for the herd. Her full sister Mickey's Mocha also passed away young from pythosis. But her half sister Seaside still has a legacy on the island with Seaside Miracle and the offspring of Tuney. Her sire also has multiple descendants still on Assateague.

Shared Impulse was a bay with a chestnut sire so that tells us she carried recessive chestnut. If we didn't know her sire, she produced a chestnut pinto filly in 2007 so that also tells us she carried chestnut. She and her sire Cherokee Chief had one copy of agouti. Because Shared Impulse's dam was black she didn't have a copy. Agouti is what makes a black into a bay. Cherokee Chief sired a couple blacks and couldn't have if he'd had two copies of agouti.
https://www.thecolorfulchincoteague.com/bay.html
https://www.thecolorfulchincoteague.com/chestnut.html

Both of Shared Impulse's parents were tobiano pinto and so was she. All three of her foals were also tobiano. She might have been homozygous for tobiano, but three foals wasn't enough to know for sure.
https://www.thecolorfulchincoteague.com/tobiano.html

She was more on the minimal side of tobianos. Her dam was too. They appear to have something suppressing the amount of white tobiano is trying to put on them. And it appears to be genetic even though it's not something that can be tested for.
https://www.thecolorfulchincoteague.com/minimaltobiano.html