This little porker started life as a still jpeg picture. I used GIF Animator 5's lasso tool to trace around his arm. I then cut and pasted, which gave me a new object. I also cut & pasted the eyebrows and that thing at his elbow.
The main picture had to be retouched to fill in the gap from the missing arm. GA 5 was used for that.
To animate the arm, I made two copies of it. The Transform tool's Rotate function was used for this. One arm was rotated x degrees clockwise, and the other x degrees counterclockwise. I set the center point of the rotation to the tip of his elbow.
A shadow was added to the arm objects for a nice touch.