This is my first year with Rizzo and Fatso for Christmas...so far Rizzo hasn't really bothered with the tree, Fatso on the other hand has been exploring it, I'm worried that he'll probably mark it. He has been getting better, but still from time to time I find cat pee in my house, so I'm hoping he's gotten over it and will continue to not mark up my house. I'm pretty excited about this year though, time to start looking for doggy presents