Tried to practice hands and feet!
(I farted my grammar on the text, but well...)

For the skeleton of the paw, I used this picture: http://www.flickr.com/photos/galler.....jc/4328074331/

The best way to understand the human and animal body, its by understanding the amazing and perfect mechanical wonder that is the skeleton. We are talking about a structure that was made by the evolution, the perfectionism of those first cells in the world. Probably the most amazing architecture that Nature can make.