Jenkins the Horse

This is Jenkins, a gray and brown horse who is Finris' loyal steed. He is rather old, but his will is strong and he has been trained to come at a whistle.

Could someone who knows about horses please tell me if this coloration is impossible to breed or if the markings are impossible to get? I tried to do research so he would be like a real horse, but horse colors are are hard to learn about.

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Jenkins is (c) me so don't you dare steal him.