@asherkin are you sure tho? Mine is about 100x48 and there are multiple frames.
@OP. AFAIK, GIFs can be resized in two ways, the first one will not blur the frame, and the secondary method will eat some parts of the image, but will still contain multiple frames.
Tho, this is a great GIF manipulating webtool:
https://ezgif.com/.