Why were bloodhounds used for tracking slaves?

Bloodhounds were primarily used for their strong sense of smell. Since these slaves escaped from their plantations an downers to track the slaves and bring them back to a plantation the overseer or boss of the slaves would usually use their bloodhound dogs to track the escaped slaves.

They did this because the process of capturing slaves would be gradually easier with the dogs because their key sense of the smelling of everything in their surroundings to everything in far distances, of course it would get weak and very poor when the bloodhound got near water.

But, overall they were used in the process of tracking escaped slaves because their strong sense of smell.