[Simp]

Seems like it has already been done:

In 2002, other head transplants were also conducted in Japan in rats. Unlike the head transplants performed by Dr. White, however, these head transplants involved grafting one rat's head onto the body of another rat that kept its head. Thus, the rat ended up with two heads.[10]

[dimitar]

This has been done over 100 years ago with dogs.

[toxicFork]

I consider that to be even better! Did the other rat's head have any way to control anything in the body, or was it more like a guest?

[bjwbell]

I'm guessing it's more like it died after a short period of time.

If you look at the history of head transplants (yes a gruesome area), they ALL end badly for the subject.