Panzram and Warriorstrike have actually made it clear.

I also don't know if there are any tutorials around here but as mentioned Photoshop, Gimp and Sai are great programs. Although, it's not very easy and requires some practice before you can actually draw perfect fur texture. So first I recommend you to practice floof. <3 In the mean time you can have a look at these presets I have provided below (when clicked link) which show amazing fur textures done by other users on Deviantart and possibly, take something out from them, so
click here!Enjoy. :3