There's a reason the Airedale Terrier carries the title "King of Terriers" — and it has nothing to do with being the loudest in the room (though, let's be honest, they're capable). At 50–70 pounds, the Airedale is the largest terrier breed on earth, and it wears that crown with a quiet, self-assured authority that's uniquely its own. Smart enough to outsmart you, athletic enough to tire you out, and...