We couldn't have our pre-lit artificial tree up for 2 years. Young crazy cat wouldn't leave it alone. The first Christmas we had him he was maybe 8 months old. He took one look at that tree and took a flying leap. 5 minutes after putting it up we took it down. The next year he was still insane, so we didn't put it up.

He has calmed-down considerably, especially in the past year. So now we don't worry about it. Last year we put it up and he would lay under it for hours looking up at the lights. I don't think he even batted at a single ornament.