In Hollywood, there are two iconic dogs: Lassie and Rin-Tin-Tin.
Rin-Tin-Tin, or, Rinty, to use the nickname given to him on his 1954-9 ABC series, began his career in silent films in the 20's, so this was a descendant who appeared in the 50's. The Adventures of Rin-Tin-Tin originally aired on Friday nights, then had reruns air in the afternoon. CBS picked up rerun rights to put the series in their Saturday morning package in 1962. In 1976, the series was brought back for a syndicated run with the episodes now slightly colorized. That's how I first came across the show, airing as an after-school entry on what is now the local NBC affiliate, WNYT (which was an ABC affiliate when they picked up the colorized version).
Unlike Lassie, this series was set in the Old West, with Rinty and his owner, a young boy named Rusty (Lee Aaker) on an Army base, where Rusty had to be the youngest soldier in history. Cast member Abel Fernandez later moved on to The Untouchables, for which he's better known.
Following is a sample episode:
I only caught bits and pieces, and don't recall seeing a full episode, hence no rating.