I don't even bother with a tree anymore! Izzy doesn't bother it, but I am sure Gus would. They probbly would also play and knock it over. I also have 5 cats. The first year I was in my house (moved in 3 yrs ago), I got this HUGE tree, like over 8 feet tall, and one of the cats climbed up it and broke a huge branch off, that left a big gap in the tree, so I took atheletic tape and held the branch back up! The cats also like to take all the ornaments off. Gus did see the tree at my parents house, and he looked at it like he was confused, like, what is that tree doing in the house. It isn't decorated yet, so I will see what he does with the ornaments. Our cocker spaniel we had growing up chewed the foot off a dog ornment. That was the only thing he really ever chewed. We still have that ornament to this day even though he is still no longer around. Every year when we put it up, we remember him. We had left him home and came home to find 1 ornament on the floor,the dog one, with a chewed off leg, hehehe.