Love the info in this, though had a question. I prefer survival mode to creative, but find that it's sometimes easier to build with the peaceful setting on. With that said, will wolves and the cats still spawn, or do I have to keep it on easy or higher for that. I've been on several seeds now looking, and have only found wolves once, and it was on normal mode. Thanks for any help!
In peaceful mode, only hostile mobs stop spawning (except the ender dragon), so wolves and ocelots/cats should still spawn. For the list of hostile mobs, see here: