And Lego saves his boy from waking nightmares too. Like when Tupper starts banging his head against objects or scratching and biting himself.
The ever-watchful dog often just needs to nudge Tupper to break that self-destructive pattern.
There were also times when Tupper would simply bolt into traffic when he's outside. Not so much any more. He likes to stay close to Lego. And even the boy does decide to run, Lego simply holds him with a well-placed paw.
"Lego is learning to chase down and contain Tupper to give us time to catch him," Dunlop says.