You could try to block access to the furniture but if he's determined, it probably won't matter much. We got a large, sturdy plastic baby fence (you can position it in any number of ways) to put around the hot tub. Tub is partially sunk into the deck and a couple of the dogs over the years would jump up on that so they could see over the fence. I guess between the vine and age, the older one no longer does this (she used to just knock the fence over) and the younger one has never tried...but he's the only one who didn't!