"Lassie" was seen on CBS-TV for the first time. Despite being called “girl” by Jeff Miller, who starred as Tommy, and Jan Clayton, who starred as Jeff's mom, Ellen, Lassie was, in reality, a male dog. In fact, there were more than a half-dozen Lassie dogs doing stunts. "Lassie" ran on CBS for exactly 17 years. The last show aired on September 12, 1971. Granny loved watching Lassie.