ominousplay, you are doing good so far, it looks nice.

One work around way of changing the fur texture is to open the cr2 file in a text editor (for example EditPad Lite which is free and can handle big files easy). Then do a search and replace with the new texture name.
Example:
Open the cr2 file in EditPad Lite.
Search for .jpg (gives the first instans of the texture file) - you'll get for example 'greywolf.jpg'
Replace all 'greywolf.jpg' with your new texture, for example 'blackwolf.jpg'
Save the cr2 with another name.
Done.

Be sure to have the correct file path for the new texture incase it is not in the same directory as the previous texture.