I wouldn't recommend my method, but I took chicken wire and made it into the shape of a cone that was about the size that I wanted, and then "molded" or shaped it with my hands until I got the shape I wanted.
then I covered it with strips of duct tape, glued on a layer of felt, and then covered in fabric.
the tail was just a piece of wire with cardboard attached to it, and then more felt was added to make it round.
the eyes could be made with either clay or foam. either way I suggest using some kind of sealant, then paint, then a finish (like a gloss)
the tongue would be easy, just 2 strips of wire covered in fabric and then rolled into a spiral.
oh and for the brim of that, I've heard that craft foam is a good option (the stuff that people use for armor sometimes)
I had no idea how to make the hat sit on my head, so I just got another hat and stuffed it inside.