Nostalgia Piece - The Littlest Hobo

This was a Canadian television show in maybe the early 80's. The dog? It belonged to no one! To no one! The dog would enter into a troubled family, turn their lives around, and ask nothing in return. Despite the pleadings of the renewed family for the dog to stay, the dog could not stay, because it belonged to no one. The dog went on its way, and a tearjerking theramin sequence preceded the heartwrenching theme song as the ending credits CONCLUSED you to be awash in the tears.