Barney
Little House on the Prairie Wiki
Barney and Laura Ingalls (Melissa Gilbert).
Barney was the dog who played Jack on Little House on the Prairie. In the original book series, Jack was a bulldog. "But Michael Landon didn't care, he fell in love with Barney at first sight, Melissa Gilbert was crazy about him too."[1]
Barney's final appearance on the show was the first episode of Season 4 titled "Castoffs" where Laura found Jack dead in the barn. He was still seen running down the hill with Laura in the end credits through most of the series.
Barney also had a larger contract than some of the actors did on the show.[2]
