Sandy and Lud live on the top of a beautiful bluff with lots of acreage for Vader to run and play. I'm pretty sure they do not need to actually use the locks on their home as long as Vader is around. He is quite a guard dog! Nothing gets past him. But present him with a tennis ball and he melts...there's nothing he likes better than to race around chasing his tennis ball. Does he ever get tired? I don't think so.
Vader loves to spend time outside with Sandy while she gardens, protecting her from all evil. And although they roam everywhere, the deer are not a problem. They very wisely steer clear of Vader's garden.