The incident happened over the 4th of July weekend outside of a home on West Pine Street. In the video, you can see the man inside a silver sedan, throwing the firework into the front yard.
The firework exploded in the dog's face, causing significant burns and bleeding.
The injuries are non-life-threatening, and the dog, whose name is Romeo, is expected to be ok.
Anyone with information is urged to contact the Santa Ana Police Department.