Is there anything else (besides dowels) that's used for support between stacked cakes?
Some people use bubble tea straws, regular drinking straws or even lollipop sticks. From what I have read here at CC, dowelling or bubble tea straws are most popular. And then there is the SPS. HTH.
What is sps?
Here are the instructions for SPS http://www.cakecentral.com/cake-decorating-ftopict-603925.html