The term 'Barkless Dog' refers to four different breeds of dogs that do not bark. The first breed is the BASENJI, which is a small hunting dog from Central Africa. It has a short, smooth coat and a curled tail. The second breed is the Basenjis, which is a cross between a BASENJI and a Saluki. It is a medium-sized dog with a long, silky coat. The third breed is the OTTO, which is a small, white, fluffy lapdog from Germany. The fourth breed is the Canem, which is a large, muscular guard dog from Italy. All four of these breeds are known for their lack of barking.