Looking for a similar movie

Hi, I need your help a friend of mine remembers an animation movie of her childhood, it deals about a little boy who become friends with a little bull, some time later they get out of sight, some time later the little boy became a toreador and has an announced fight with a bull, suddenly both remember each other and fall in each other "arms"...

Does anyone of you know the movie

Your help is very much appreciated

All Lust Wants Eternity