The Basenji is a breed of hunting dog. It was bred from stock that originated in central Africa more than 5000 years ago.
Most of the major kennel clubs in the English-speaking world place the breed in the hound group—more specifically, in the sighthound type.
Basenji dogs have many unique features making them impossible to confuse with other dogs.
First, they can't bark (yeah, for real!). This dog can bark at least in the conventional sense of the word. Instead of barking, the Basenji makes characteristic yoda-like sounds. But you can only hear them when the dog is excited.
Second, when the dog puts his ears together, it has funny wrinkles on its forehead just like a human.
And the last feature is the tightly curled tail.
This may seem surprising but Basenji dogs don't have the unpleasant odor that all the other dogs have sometime after bathing.
Often you can see this dog washing itself like cats do. And the Basenji's coat is considered to be hypoallergenic.
It's worth mentioning that a litter of Basenji is very small – on average only four to five puppies are born. Other dog breeds can give birth to up to 15 puppies at a time.
Maybe this is the reason for their rarity.