Use it as an opportunity to teach 'leave it'?
And train to not trash the house?
When we have young dogs (younger than 2ish yrs), we decorate as normal - there tends to be nothing unusual to grab at low down and use an unfolding play pen to fence off the tree if we go out.
If we're there, they remember they've been trained to leave it alone. If we are out, I don't want to run the risk they might forget. It is too easy to have a disaster. We have never put anything edible on or under the tree - these dogs have v, v good noses and it would be asking for trouble!