This is an easy one! Tree goes in a playpen! Then you can have lights and decorations all the way down, and presents can be tucked under, too, without anyone being able to chew them! We put a playpen around the tree when we had Gracie the Great Dane mix. She had no idea where her tail was at any given moment, so everything tail-high and below (more than half the tree) was otherwise denuded if Gracie was happy and in the living room.