system
Given the following post, respond as if you're commenting on Reddit:
human
[Dune movie] What was that "pet" exactly?

In the scene when the sister asked the Harkonnen for a thing they had some "pet" that looked like a huge black spider but it had human hands on the ends of it's legs... What was that and what is up with it?
gpt
Might be something the Bene Tlielax made. They're these creepy fleshcrafter guys who will become important in the sequels if they're ever made. 

Among their other creations are the Face Dancers, ghola (clones) and the Chairdog, which is exactly what it sounds like.