Basenji Dogs are barkless.
They don’t bark, they yodel!
The Basenji is a breed of dog native to Central Africa, utilized as a proficient hunter. It first left the Congo in ancient times as a gift to Egyptian pharaohs. It only made his way to England or America in the mid-1900s. The Basenji is barkless, due to its narrow larynx. As a result, instead of barking, the Basenji vocalizes through yodels — which sound like “baroos” or howls (go to 0:50 mark):
Hunters likely selected the Basenji’s barkless trait deliberately; barks may have stunted a hunt by alarming rival hunters or scaring off prey. Basenjis are known for their remarkable intelligence—as well as their tendency to be stubborn and mischievous. Inquisitive, Basenjis will likely eat anything you leave lying around, or will crawl through a fence to explore the neighborhood.
Additionally, while Basenji dogs can certainly learn commands, they may choose to ignore them.