This is not really an animation, you just moved the legs around a bit. You need key frames, motion, anatomic correctness, etc. There's no shortcuts here.
In terms of what's next, I think weight is probably the most important thing. Try animating the upper legs so it looks like weight is shifting as the beast moves. Walking on four legs is all about redistributing weight so you can move a certain limb. As long as there's weight on a limb, you can't move it, so you shift it to the other limbs first. There's also a fundamental flaw in that I don't think hogs move two legs on the same side at the same time (no animal does afaik). You want to study some animation from real animals and maybe some old Disney stuff to get this right.