If you don't give your dog a job, trust me, they will pick a job for themselves and it may not be to your liking. Quincy has had many jobs over the last ten years, my liking buddy, agility partner, demo dog in our Dogsafe classes, biking companion, snuggle bug, paddle board companion, security, and most recently a big sister and role model for Skye.
Some of these jobs came naturally to her others we learned together with training and fun diligence. All of them have led to an incredibly strong bond and communications so in tune that we rarely even think that we are two species.
How do you choose a job for your dog? Well, think about you and your dogs personalities and needs. Apart from the common jobs of companionship and door bell think about a ball retriever, scent worker (use that sniffer), agility (burn some energy), flyball, joring (combination of dog and human power in pulling & running/skiing/biking or here's a new one to me Sulky pulling. https://www.youtube.com/watch?v=eqaqGYFaYW4
I haven't decided which one(s) Skye and I will do but rest assure, with her energy and brains we will have one. Presently our focus is on our sign language and recall.