Oh gosh. My cats were terrible this year! My two older boys know not to mess with the tree, but I have two little ones that thought it was great. We tried to hang the ornaments up high enough so they couldn't reach them, but they still got several. Fortunately the ones on the bottom weren't glass except two that my younger sister hung. The boys broke both and tried to play with them after. Fortunately I was able to get the glass away from both of them very very quickly. There was one point where one of the boys ran off of the entertainment center and jumped into the tree! You know the Halloween decorations with the witches splattered against the tree? That was pretty much how my kitten looked.