Create animation for pre existing spritesheet

I’m trying to make a small animation, and already have a spritesheet: http://pigrunner.herokuapp.com/assets/img/Animals/Pig/Pig.png.
My problem is, it doesn’t have a plist file, as it wasn’t created with TexturePacker/Zwoptex, and all tutorials regarding animations seem to require a plist.
Is there some way around this?

you need in plist or xml file, without it you can’t use this spritesheet. If you haven’t last you can slice your picture by photoshop or any other image editor and create animation from separated files. (you should remember that separated pictures must be the same size ).