In the 1950s, a Russian Vladimir Demikhov successfully transplanted dogs' heads onto the bodies of other dogs, creating living two-headed dogs,see video here (warning -graphic content). Doctor Robert White transplanted the head of one monkey on to another monkey's body in 1970. Dr. White's monkey survived for only 9 days. See video here (graphic content).
However, Surgeon Sergio Canavero, director of the Turin Advanced Neuromodulation Group in Italy believes he can overcome the difficulties both scientists experienced with new surgical techniques although he remains worried that the concept may not be welcome.
I think it's a good idea if it works.