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Why are bloodhounds and German shepherds useful for scent-tracking work?

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A Labradoodle dog runs energetically through grass with a stick in its mouth, ears flopping and tail raised. — dog A Labradoodle is a cross between a Labrador Retriever and a Poodle, a mix intended to incorporate the Poodle's intelligence and low-shedding coat with a Lab's energy and determination.

Bloodhounds and German shepherds are highly effective in scent-tracking work due to their superior olfactory capabilities and specific physical and temperamental traits.

Bloodhounds

Bloodhounds possess approximately 230 million to 300 million scent receptors, the highest number among dog breeds and roughly 40 times that of humans. Their physical structure is uniquely adapted for tracking:12
* Facial Features: Their long, drooping ears stir up scent particles, while loose facial skin and folds trap and hold scents near their nose.12
* Temperament: They are relentless, calm, and deliberate trackers that are difficult to distract once they are on a trail.12

German Shepherds

German shepherds are also noted for their keenly developed sense of smell, which is significantly more acute than that of humans. Their utility in tracking stems from:34
* Intelligence and Trainability: They are highly intelligent, alert, and eager to learn, making them versatile for complex police and military tasks.4
* Versatility: Beyond tracking fugitives, they are frequently utilized for search-and-rescue operations and the detection of illicit substances.4

Both breeds are valued for their ability to distinguish individual scents over vast distances and challenging terrain.13