How dogs detect their prey?

Answer 1

A dog can smell a single grain of salt dissolved in a bathtub of water. They track people by the smell of their footprints. A bloodhound can smell things about 1,000,000 times better than a human.

Answer 2

Dogs detect their prey through smell. Their sense of smell is very acute. A dog's sense of smell is 10,000 - 100,000 more powerful than a human's.

Answer 3

Pheromones.