The writer of this novel is a brazilian youtuber called "Zy" that was exposed a few months ago for exchanging nude pictures with an underage girl that was one of his subscribers. She was around 15.
MC is obviously treating them like pets. 🤣 All of these similes relating to how one would view their furry companions. It also shows that MC is more partial to cats than dogs, or maybe it's the author's preference.