The footage shows the Labrador retriever refusing to leave the side of another dog that was killed by a car.
A driver who saw the dogs on a La Puente street put down traffic cones to alert other drivers and shoot the video. The black female Labrador retriever can be seen next to the one that was fatally struck.
The Los Angeles County Department of Animal Care and Control said the 2-year-old dog, who they've named Grace, appears to have been well cared for, but nobody has come forward to claim her so she is up for adoption.
If you'd like to adopt Grace, call the Baldwin Park Animal Care Center at (626) 962-3577. Grace's impound number is A4416170.