Fictional Turnaround

What if the monster from "Who Goes There?"/The Thing/The Thing From Another World weren't a crew member of the crashed alien craft, but a pet or biological specimen?
 
As just one example of how a pet could be hazardous, ordinary hogs escaped from farms become dangerous boars. So, the pet is suddenly left without its masters and shoved into a strange, hostile environment. Long-dormant instincts manifest, and it behaves not only in a hostile manner, but begins trying to reproduce. 

Poor Thing... :-)