Brilliant but not for beginners

My Mal is the smartest dog I have ever owned and also the most demanding. He figured out how to open every door in my house within a month. He needs a job. We do agility, nosework, and obedience trials. When he is well stimulated he is calm, affectionate, and a joy to live with. When something is off in his schedule he becomes restless and mouthy. Incredibly rewarding for the right person.