Step 1:
Prefold over these two lines.

Step 6:
Press this place flat

Step 5:
Valley-fold over these two lines.

Step 2:
Valley-fold over these two lines.

Step 4:
Valley-fold the edges just a little off the centerline.

Step 3:
Fold the corners to the spots indicated by the small arrows.

Step 10:
Fold over these four lines.

Step 8:
Valley-fold over these two lines.

Step 9:
Press these two places flat.

Step 7:
Fold over these four lines, then turn the model.

Step 16:
Hold the model on the spot indicated by the large dot. Then push the tail upwards with your other hand.

Step 15:
Hold the model on the spot indicated by the large dot. Then push the head to the right with your other hand. The line on the left is a mountain-fold and the line on the right is a valley-fold. Make the same folds on the other side.

Step 12:
Press these places flat.

Step 11:
Valley-fold over these two lines.

Step 14:
Fold the model in half

Step 13:
Mountain-fold over these two lines, start with the line on the left.

Step 18:
Press the model inwards on this spot too.

Step 17:
Press the edge inwards with your finger by making an inside reverse fold over these three lines. Do the same on the other side.