I feel ill

On the way to work today, either a cat or a possum (it was still dark, so I couldn't see) ran under my wheels. There was nothing I could do, it happened too quickly. I felt him go under at least two wheels. There were cars all around me, and the animal was in the lane next to me, so I couldn't go back to see if he was still alive. I hate it when animals get hurt, I just feel sick now. :(