My cat thinks that I put up the Christmas tree for his own personal use!! Last year he would climb in and sit for hours. This year is 13 lbs and the branches slowly sink to the ground when he gets in it. Last year I used a whole can of Cat/Kitten Repellent...NOT...it didnt even phase his little tailess butt. I read somewhere that Eucalyptus is a natural deterrent for cats...NOT...when I brought it home he smelled it and started rubbbing up against it. This year my sweet little fatty (Puddin') hasn't pulled the tree over yet, but I decided to just go with white lights and red bows. I also have 3 little cat ornaments that look like him at the top of the tree. The best thing to do is have a sense of humor about it...I have the best picture of my little boy kitty sitting right in the tree last year. I made a special frame for it and I have it displayed this year!