To resize animated gif images is really easy, follow these steps:
1 - Go HERE and get the Animated Gif Re-Sizer.
2 - Once downloaded, open it up and select the image you want to change.
3 - Select the output folder, size and name.
For the sizes, any aspect cannot exceed 50 pixels
50x50 looks the best.
4 - Once you click re-size, the image will be saved at your designated location with the name you gave it.
5 - And your done, you can now edit your profile and have an animated avatar icon....
If you need any further held, send me a PM and I will see what I can do.
Hope this helped :)