Fedor Jeftichew, better known as Jo-Jo the Dog-Faced Boy, (later Jo-Jo the Dog-Faced Man) is perhaps one of the most famous sideshow performers. He was born in St. Petersburg, Russia in 1868. He suffered from the medical condition hypertrichosis. He toured with his father, Adrian , who suffered from the same ailment and had performed in French circuses. He continued to tour with his son before his death. Fedor eventually signed a contract with P.T. Barnum, who brought him to the United States in 1884, when he was sixteen.

Barnum created a story that involved a hunter in Kostroma who tracked Fedor and his father to their cave and captured them. Barnum described Adrian as a savage who could not be civilized. Barnum made a point of stressing Fedor's resemblance to a dog, and explained that when he was upset he would bark and growl. In the show, Fedor obliged by doing so.

Fedor spoke Russian, German, and English, and toured Europe and the United States extensively.

He died in Salonica, Turkey (now part of Greece), from pneumonia on January 31st, 1904.