I remember this movie vividly Mark.
It's called "Outrage" with Robert Culp as the good upstanding small calif. town Dr. turned vigilante to protect his own family from teenage car thugs who terroized him,his wife & kids and of course their dog.
It was a made for TV movie of the week & aired on ABC in 1973.
I was home sick that day from school when it aired and remember the campy acting,but dug the script & cars,especially that flamboyantly painted 57 Nomad.
Huh...Based on a True story.
http://www.imdb.com/title/tt0070497/