I just recently did some googling. I would have thought it was around 10% too.
But, dogs don't mind the smell of poop. I think that to them it's like us having colour vision. I don't really dislike most colours, they're just colours. Maybe for a dog, they are just smells.
I think you may have something there.
One of my dogs is sleeping with his head resting on my foot right now... that was in a wet sneaker most of the day