My house is DNA encoded to myself.....it has a whole range of classified biometric, visual and audible security procedures that when violated cause my house to enter an alternative state of existence which is also encoded to mine and my families specific DNA and specific biological signatures and other classified criteria...this existence is only able to support our distinct and unique personalities and all others simply cease to exist as if they never were, there is also an automated, unassailable failsafe system that alters the timeline in the unlikely event that the system is circumvented....this reverts the universe to an earlier point in time and subsequently modifies the system to compensate for any compromise to the system......
I did think about buying a dog, but I though it was overkill!