Chinese scientists have used gene editing techniques to modify a small breed of pigs into "micro-pigs" according to this report. The intent was to make the pigs smaller, therefore cheaper to raise as models for human disease. They didn't foresee that a nice small pig would have potential as a pet.
IMHO genetic modification is like a horror movie, or Fantasia, where you see the water or other liquid coming under the door, the hero tries to keep it out, or clean it up, succeeding momentarily but ultimately failing. (Not that I think genetic modification is a threat, per se, but it is change and some changes are mostly irresistable.)