Taylor Mae Stinchcomb, 15, took off in her family's Dodge minivan from their home on Tuesday with her 6-year-old Doberman, Romulus, who had just be diagnosed with cancer.
She was fleeing her home after being told the cancer-stricken pup was going to have to be put down.
She picked up a 15-year-old friend and, at one point, she turned the wheel over to the friend after becoming to distraught to drive, cops said.
That girl later lost control of the van, which flipped off the road and slammed into several trees and a utility pole.
The dog was thrown from the car and also killed.
The other girl survived with minor injuries.
Photo: WGN9 Chicago