Dogs have over 200 million scenting receptors, while we mere humans only have about five million. Some dogs have built-in scenting accessories for tracking, like long floppy ears that scoop the scent from the ground, and wrinkly folds of skin that hold the scent particles while they are sniffing. In some cases, good trackers have short legs, so their nose is closer to the ground where the scent is. Excellent breeds for tracking should be good listeners, strong-bodied, and obedient, while also having a lot of energy and stamina. Here are the top 11 dog breeds for tracking.