Nina, you'd be a very deluded slave if you left it to chance imo
Imagine an 8mth old gsd and your cats and the lot of em looking around for mischief they can be getting into and spotting a lovely,well thought out decorated xmas tree and then they think "Better not,mum said no" and trotting along to "play" with something else...exactly
More likely they'd absolutely destroy it and lay the blame on your puppy