https://bladerunner.fandom.com/wiki/Artificial_animal
There can be many reasons to have fake animals run by A.I.
https://filmgoblin.com/goblin/animals-of-blade-runner-part-1
https://en.wikipedia.org/wiki/Digital_pet
https://moviepaws.com/2017/10/22/owls-snakes-and-unicorns-the-animals-of-blade-runner
https://en.wikipedia.org/wiki/Digital_pet#Digital_pets_over_real_pets
Someday, Artificial pets and animals in general, might be mistaken for real ones. There could be a need to have ID & tracking tech in almost any life form to indicate whether its real or synthetic.
Thus, Artificial people or Replicants might eventually become indistinguishable from genuine humans. This would also require natural humans to be constantly verified. Managed by AI, of course.
https://en.wikipedia.org/wiki/Replicant#Physical_composition
https://newhumanist.org.uk/articles/5424/ai-in-the-year-of-blade-runner
https://thedigitallabyrinth.blogspot.com/search?q=Artificial+Life