Several different cats over the years have ignored the tree for the most part here, other than batting at the ornaments close to the bottom, so we've just made sure not to hang anything fragile within a couple feet or so of the bottom. That's all the further up they would bother to look, anyway.
However, 
this fella showed up on the farm back in October and he can be a real stinker sometimes! The vet estimates him at being 10-11 months old now, meaning he probably has never seen a Christmas tree in his life, soooo... Might be an interesting year for us. 

 Casper, my fluffy boy 
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View attachment 2922047