Oh, you should see some of the measurements in the concept art.  It's kind of weird, the sense of scale they have.  Not to mention that the distance counter in-game (for example, your distance from the highest point of Fate's Plaza in Round 2 as the sweepers, visible on the pause screen) seems to think that a metre is a really long way, at least compared to the cats' size.  Maybe everybody's really small and we just never knew.  That'd be kind of amusing, given that they're cats and pigs, but as you said, it falls apart when you compare them to the humans.  Ugh.