What scents do dogs find appealing?

I am researching scents that dogs find appealing and can't find anything useful any where. I will take answers and especially websites. OTHER QUESTIONS: How does scent affect food preference with dogs? AND Which scent of the following chews do you think dogs would find most appealing and choose if you layed it out in front of them: Chicken with mint & parsley, chicken with chamomile & lavendar, or chicken with flaxseed and vitamins.