LOL! Yes, jobs come in all kinds of forms. My Chihuahuas have a job. That is to sit on my lap and lick me. Oh, and they have another very important job and that is to protect the house from the bears outside. Jose was a capable bear runner offer. And those ferocious barks...they'd scare anything away.
Then there's Lyric, my Dobe. He has a job. That is to make sure I'm doing everything right...from showering to cooking, to cleaning, to yard work. He's my shadow and supervisor.
Then I give him the additional jobs of obedience training. "It's work time" and he perks up and is soooooo ready to work. It's also agility practice. That's a job. At home he runs around the perimeter of the acreage and makes sure everything is on the up and up. (or so he's practicing)
On our hikes, he sniffs the ground like a hound dog and keeps the path ahead clear of any danger. (LOL) That's what he's doing, all right. At home, inside at night especially, he's up at the slightest, unusual noise and ready to confront and protect. He's alert and never really sleeping on the job...not totally.
So yes, all dogs, especially the working group need to keep busy with exercise for their bodies as well as their minds. It doesn't have to be exactly what they were bred for, but it helps if it resembles what they were bred for.
A German Shepherd doesn't have to have a herd of sheep to protect or herd, but it has to have something to make it feel like it's useful and working. A Doberman has to be close to it's family or person most of the time and would be miserable if left alone for long periods. It's got this intense drive to be close and watchful over it's master...incredibly loyal, affectionate and obedient.