This is my attempt at importing the wolf. The picture doesn't convey this very well, but the wolf in it is flashing. You do not want your monster graphic flashing, otherwise, the monster will have a box around him. Instead what you want to do, is have the background behind the wolf flashing.
To do that, just click behind the monster until the background flashes just like the above picture. Now let's see what happens when we try to test our wolf graphic.
That's much better. So now you can import what you want into Rpg Maker 2000/2003. Just remember to keep in mind the monster graphic must be 256 colors in either png, bmp, or xyz format.