The story of Belle and Sebastian is by Cecile Aubrey named after the
Pyrenean mountain dog and little boy (and the band is indeed named after them). As to which version you watched I know that a cartoon by Toshiyuki Kashikuran was made but I can't remember the year. In addition there was either a dubbed or subtitled black and white version in from 1967. It can be found here http://www.memorabletv.com/episodeguides/belleandsebastian.h tm
You'll be asking about the flashing blade or White Horses next.