OK... so how does a bloodhound do it? Tell different scent traces apart, track them for miles?
Is it a bacterial mix? Or something else?
Let’s ask McGruff the Crime Dog!
IMO, it’s mostly by the scent of your skin cells. YOu can take a shower and use deodorant, and a dog can still follow you. Even if you use anti-bacterial soap and scrub thoroughly. Even if you use bleach. Now, if you’re real stinky because you haven’t showered, I’m sure the dog will be able to pick up on that, too.