>>27667038I think that the idea, the more I look at the two side-by-side, might be that the prevo is intentionally "awkward" in terms of the proportions of its body. The limbs seem a bit too long, the head is too big, and the mouth is too large for its face. When it grows up it "fills out"; its mouth is now just the right size and its body is big enough for its unwieldy limbs and bulbous head.
