We always get a fake tree so sometimes they chew on the branches, but we don't hang ornaments off the very bottom row so they don't really bother it otherwise. My very first cat climbed our tree a little when I was young and my second cat loved to sit under it because the lights made it warm. I just love Christmas! We have the cat tree right next to the dinner table so I know they will be watching everything over Thanksgiving dinner, haha.