Once the pieces are cut out, each half should be stitched together. Stitching should really be done by hand, conventional sewing machines are not usually up to the task of sewing through faux fur. Once you have the halves made, you need to put them together so the fur sides are facing each other and the backs are facing out. Run an endless stitch along the edge (leaving a gap at the top for stuffing). Once this is done, you need to turn your tail right-side out. You now have a structurally complete tail :3