Hoero! Bun Bun
Genres: Adventure, Slice of Life
Type: TV, Episodes: 39
Aired: Oct 9, 1980 to Jul 9, 1981
Source: Unknown
Rating: G - All Ages
Synopsis:
Bunbun, an abandoned puppy meets the old Big, also a stray dog. Bunbun will learn to survive in an hostile and strange world. 

(Source: manga-distribution.fr)