Didn't the russians do this with dogs a LONG time ago?
If I recall, it wasn't a transplant, just a head without a biological body. In other words, a head supported by mechanical heart and lungs, among other things. I think it died because it wasn't a long-term study and there was no means of nutrition/sustenance provided.
edit:
Looking into that further, actually it was dead, and was "revived" with an artificial heart and oxygenated blood. I'm curious if the oxygenated blood was simply providing energy for electrical activation of neural tissue, rather than reviving a fully alive "head."
There's still some suspicion over the reality of that and similar experiments from that era, but they were demonstrated on more than one occasion, and the science was dissected in research journals and even in Time magazine when it was new way back.
The videos may have been staged for dramatic effect (this is debated), but the actual experiments did occur with mixed results. Sergei Brukhonenko developed the autojector which he used in this experiments, and that device was crucial to the further development of the artificial heart and lung technology, and his research helped further open heart surgery in Russia.