Seton Doubutsuki: Risu no Banner
English name: Bannertail: The Story of Gray Squirrel
Genres: Drama
Type: TV, Episodes: 26
Aired: Apr 7, 1979 to Sep 29, 1979
Studio: Nippon Animation
Source: Unknown
Rating: G - All Ages
Synopsis:
Soon after birth a young squirrel comesc to a farm, and gets caught by a human. This human then tries to find him to their pet cat. However, the cat feels sorry for the squirrel and adopts him as their child and names the squirrel Banner. Banner and the cat live happily in the farm, but their happy lives don't last long. A fire destoys the farm, and Banner gets separated from his mother the cat. 

(Source: ANN)