Originally posted by Reivag:

I have an old world and I see that they set new features it is necessary the creation of a new world to find wolf caves, etc?

Like others have mentioned, you can either explore new areas or use the Upgrade Mod. I've used it and its pretty useful. Just install (copy paste per instructions), run the game, run the mod cmds, quit, uninstall, go back to your game.

By default areas near your buildings are not affected by the cmds so you can probably just use it without changing anything, but there are a bunch of variables you can change if you want to experiment. Recommend to read the manual carefully if you do, tho.