K9 Diesel had been part of the Sebastian Police Department for about a year. He was found inside the K9 Patrol Unit parked outside the officer's Melbourne home.
Detectives won't say where the handler was when the dog died.
Management says all of its K9 vehicles are equipped with state of the art equipment.
"And that equipment is designed to, as much as you humanly possibly can protect the animal. Right now, that's part of the investigation on how it performed," said John Blackledge with the Sebastian Police Department.
The Stare Attorney's Office will determine whether any charges will be filed.