1 - Fold the sheet diagonally
 to form a triangle

2 - Fold the tip (1 sheet) towards the
 base of the triangle

3 - Fold the resulting fold inside
 inside

4 - Fold the points of the sides towards the
 top of the triangle

5 - Fold the top 2 points between the side
  and the bottom of the rhombus, then fold
 inwards, leaving about 1/3 of the points overhanging

6 - And here is an adorable fox, or
 cat... By folding the ears sideways, you get a pig!