I, too, have to chime in with the folks who prefer "Jeff's Collie" to the other incarnations of "Lassie". Tommy Rettig, rest his soul, was superb, as were Jan Clayton and George Cleveland (and the wonderful boy who played Porky, sorry, I've forgotten his name). Perfect family entertainment -- and a brilliant vehicle for teaching young and old alike the all-important lessons in empathy and do unto others. What better way to learn how to look beyond appearances and taking things at face value, than taking the time to understand what a dog is feeling or trying to tell us? Sometimes the storylines were amazing, considering the time. I saw a rerun last week that dealt with the evils of people who engage in pit bull dogfights! I feel very fortunate to have grown up with Lassie.
BTW, thanks to the poster who remembers the book "Lassie and the Secret of the Summer" -- I LOVED that book!