Work vs Play

So as some of you know I am training Rudi to become a shed hunter.
I am not sure wether to make it a game or to make it work..
Can you tell me about each and how to go about them?

What's the difference between play and work? To me, work is something that you have to do but don't really want to, whereas play is something that you do because it's fun for you and you'd pretty much choose to do it anytime.

I train service dogs. These dogs have to be ready to perform their service behaviors at all times. Their owners see the dogs as "working dogs" - but the dogs see it as play. They enjoy doing what they do because they get rewards for it. One reason that our service dogs could fail out of the program is because they don't enjoy training, they don't enjoy working.

I honestly don't know how you'd go about teaching a dog to shed hunt (or to do anything) as if he were working, instead of teaching it like a game.

Teaching as a game is so far how I am going about it..
Its like a game of fetch..

Exactly. Good for you!

If the dog is ever to work away from you, off leash, you better make sure the dog WANTS to do his job.

Thats what I am looking for..
How to get her to WANT to do her job..

Make it a game! If you make it really fun for her to keep "playing" (working), it'll motivate her to finish the "job."

Again, if anyone knows how to even teach this as if it were a job and not a game, I'd like to hear it.