Drawing a pig is very easy for kindergartners.  Here are some of the drawings from my class during the three little pigs unit:

I begin by telling the children to make a circle on the top half of the page.  Next we add an oval in the middle of that circle for the snout with two dots.  I made the eyes with two curved lines.  The ears are triangles.

I tell the children to draw an oval for the pig's body.  The legs are rectangles with upside down V's.  Finally, we add a curly tail.  They can add a horizon line and a barn if they wish.  Or any other details they desire!