A dog's life

I remember someone mentioned that in the future we might be able to use our sense of smell in games. Even though this feature is technically not available now, I was thinking of how we can make a game that focuses on the sense of smell.

Game idea:

We control and navigate the dog around the environment and using it's sense of smell, we try to accomplish certain objectives like searching for things, detecting danger etc. I figure we need a sort of unique indicator to indicate what the dog is smelling(I was thinking of a combination of the dog's expression and a meter that shows maybe the type of smell). I read somewhere that the dog can "smell" fear in human beings and danger as well so maybe we can make use of this information also.

The concept is abit sketchy now but i will post this up anyway in case someone strike on a better idea after seeing this.