This is our first christmas with our DDog and I don't know what are the do's and donts when it comes to christmas trees. She is 9 months old and large (collie x) and I have no idea how she will react to a tree with lights appearing. Also we usually get a real tree - will that hurt her if she gives it a chew? Plus she sleeps in the sitting room overnight where is where we always have the tree (not really anywhere else...) and I don't know if she's likely to chew/shred wrapping or presents. Any advice please?