Because Simon ups the ante of what he brings home. This is what I found Sunday morning when I turned the corner of my house. A nice big, curly, black wig. This wig is actually bigger then Simon. Somewhere some guy is telling his buddies about seeing a cat carrying this down the sidewalk, and his friends are telling him that he's on crack.
So not everything that Simon finds makes it into the house. A lot of stuff, particularly things like wigs, get caught up on the fence. This will soon be a non-issue once we've finished building our wooden fence, complete with an entrance for Simon and all his things.