MULBERRY, Fla. -- A Mulberry police dog left in a patrol car died after the car's air conditioning compressor failed.

Mulberry officials said the 2-year-old German shepherd named Sam Diesel was in the 2004 Crown Victoria cruiser for about an hour Monday. Officer and dog handler Sara Movahedi was inside the police station and had left the vehicle running, which Mulberry police said is standard procedure.

It's unclear when the air conditioning failed. The car was awaiting installation of a heat alarm.

The Mulberry department purchased the dog in October after Wal-Mart employees from 10 stores in Polk and Hillsborough counties donated about $12,625.

Mulberry Police Chief Lawrence Cavallaro said Movahedi was not at fault in the dog's death.