H L Gold's "A Matter of Form" (novella, brain dump): When a man lived in a dog's body

A surgeon has discovered that the pineal gland at the brain's base is the source of an
animal's identity; surgically extract & transplant it in another animal's brain, & you've put the original in a new body. And he has a rich, old & seriously ill financier who wants a young man's body!

In one of the experiments, the surgeon exchanged the identity of a kidnapped man with a dog. Only the resulting man-in-dog's-body turned out to be more determined & resourceful than either the surgeon or his financier expected...

Fact sheet.

First published: Astounding, December 1938.
Rating: A.
Nominated for Retro Hugo Awards 1939 in novella category.
Among the stories from Astounding/Analog issues edited by John Campbell.
Related: Stories of H L Gold.