A kid sees his parents drive off of the cliff

I think I remember that movie. It's called SMOKE. Smoke was a dog. It starred Ronny Howard and Earl Holliman. It was on Wonderful World of Disney back in the early 70's.

The movie is here. The car wreck is at the 1 hour and 20 minute mark.

m.youtube.com/watch?v=X_pBgsUV3AQ