Hi there, I am new here. I built two cages from cubes and coroplast. I have the males and females separated. The bottom level on our cage has coroplast with walls, and I use Yesterdays News for the bedding. One of our piggies had pnuemonia last year, and recovered, but the vet said to only use the Yesterdays News for litter. Anyway, each of the cages have 2 levels. They have ramps that go up to a full second floor. They LOVE the new cages and the ramps. However, my second floor doesn't have walls all the way around it, so I can't really put bedding up there. It falls out. I have been trying a variety of different things. The cage with the males is fine, but the females keep going potty on the second level and ruining whatever I put up there. Any suggestions? Thanks.