A caller was on the phone alerting RCMP when an erratic driver crashed near Chase Monday night.
The caller was on hold with 911 when the Mini Cooper crossed the centre line on the Trans-Canada Highway and struck an oncoming Jeep Cherokee, just after 8 p.m.
The Jeep went into the ditch and rolled several times.
The driver wasn't seriously injured, but their dog was ejected through the shattered sunroof and couldn't be found.
Police say the Mini driver had suffered a medical emergency before the collision.
He was treated by paramedics and transported to hospital for further assessment.
The following day, the dog was spotted running along the highway.
The dog and owner were happily reunited, says Sgt. Barry Kennedy.