Ginzey the dog's family thought they had explained the rules of the snow maze very clearly: Make it through in one minute, get a treat. Otherwise, you're trapped forever. But they never said he couldn't just cut through the snow.
Sure, that's self-explanatory to silly maze-building humans, but not to an exuberant dog who really wants his treat. Ginzey's not going out like Nicholson in The Shining, thank you very much. It's not his fault you assumed your paltry little walls could hold him.