| If you want to display the gif image in a web page then you can use HTML to resize it on the page as so <img src="yourimage.gif" height="XX" width="YY">
If you are looking to resize it similar to a regular flat image then you won't be able to do this easily without the original images that made up the animated gif.
Download a gif animation software pack from download.com or similar. Open up the animated gif, you'll see that it's made up of a series of flat gif images that simulate the animation (like a flicker book). You might be able to save each image individually and then resize each one to the same dimension.
Now you have to re-assemble the animated gif image. Look at the original. Each image will have certain properties around it - copy each property and then resave. | 
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