How do you make realistic stuffed animal patterns?
I am having difficulty in designing a pattren to make stuffed animals.

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www.den.rcast.u-tokyo.ac.jp/~yuki/plushie/index-e.html
It's Windows-only, and takes a bit of mucking around to get installed, but I found it quite easy to use aside from a couple of bugs.
Try making the basic shape, then experiment with adding scaly and feathery textures on top of it.
Also, don't forget the public library! Not everything can be found on the internet.
Good luck!
Can you draw a scale picture of what you want to create? That would help to visualize the final design - then you can either compare to patterns you find or be able to modify those patterns to suit your intended design.
The true difficulty in making stuffed animals is the compound curves - straight things are easy to make and attach, but anything more complex than a sphere can get pretty difficult.