The .gifs that I have worked with on Imgur that are actually a .gifv, i've been able to remove the "v" at the end of the URL to get it to work on these forums because video embedding doesn't work on these forums. But like the others here, I tried out your .gif and it doesn't seem to be working, it seems to be frozen.
I have to second what Ellen suggested. Perhaps find the same gif from a different website or re-upload that gif to imgur as a .gif file if you can convert it.