This is a partial jaw from a small Rhinoceros. It was in very hard matrix so I only took enough off to make it small and reveal the teeth. It's missing everything forward of the last premolar. So it has p3-m3 for you anatomy types.
In this second photo you can sort of see the last molar (m3) to the left which is unerupted. So this guy was a young adult just getting his last "wisdom" tooth.No horns,