More Movies like this?

I haven't seen Wizards, but it may be relevent. Or "Heavy Metal", though that is for adults.

I would recommend The Plague Dogs, the Flight of Dragons, The Last Unicorn, American Pop, The Phantom Tollbooth, Little Nemo: Adventures in Slumberland, and The Hobbit, for starters. =) Many of these movies are posted in full on Youtube; enjoy!

Heavy recommendation for Plague Dogs (there is now a widely available region 2 version that includes the original cut (not the drastically shortened theatrical version)--but as stated, really isn't a film for little kids.

No one here has mentioned the equally obscure Sanrio film Ringing Bell. Under an hour, very very dark--as far as I can tell it seems to be using sheep vs. wolves to convey a sort of samurai-esque story that might leave American viewers feeling really cold (though maybe that's why I like it.) A lamb who's mother is killed by a wolf, ultimately follows the wolf seeking to become strong for revenge. Strangely the wolf accepts him and the lamb takes on a new world view where he can't go back to the innocence of the meadow (or ignorance if you prefer), but in becoming strong, he's now isolated from everyone else. The whole thing (perhaps a bit like Last Unicorn) becomes a sort of meditation on solitude. Wish they could make more like this.

Incidentally, few of the films anyone has mentioned here (including Plague Dogs) are adult in the Fritz the Cat kind of way, which I'd call exploitational. But some of these films are definitely more a more thoughtful audience that can deal with main characters dying and complex themes. The exceptions are obviously the Bakshi films (same dude who made Fritz the Cat), which miss I think the weird groove that was going on on the outskirts of 70's animation.