There is a How To Forum with all different topics relating to pictures, avatars, etc.
Here's the link for making a moving avatar. I was correct that you need a certain amount of space to make a moving avatar. I'm not sure how much is needed to make your avatar actually move. When you become a donating member you are allowed a much larger avatar almost double in size. Notice how your picture is smaller than mine.
Here's the link:
http://www.yorkietalk.com/forums/yor...ng-avatar.html
Here's the link that explains the benefits you receive by becoming a donating member:
http://www.yorkietalk.com/forums/gen...alk-today.html