It’s a decent novel. In the early chapters (around the first few hundred) the power system is a bit skewed, with some stupidity favouring the mc. Right near the end (the last hundred or so chapters) the story speeds up a lot and the power system skews a bit again. Overall though, for the majority of the novel there weren’t major power system problems.
Referring to the title, although pets are apparent throughout the novel, once mid levelled, all tamers gains the strength as well, with an exception of some being able to fight monsters personally at low level (it makes sense and all characters who become high levelled had this capability). The pets then become companions who fight with their tamers, rather than being the only ones fighting.
The ending is probably my main issue with this novel (why it isn’t 5 star), as it was very rushed compared to everything else and leaves a lot to be desired in terms closure. It basically ends in a quick happily ever after while ignoring earlier mentioned enemies and problems. It almost feels like there should be a second novel after this one for a follow up story, but even if that were the case the ending was still too fast, making it feel unsatisfactory for wrapping up the novel.
The novel, includes some elements of Chinese philosophy like the five elements, yin and Yang, and barely touches on Taoism, but don’t read it if that’s what you’re looking for because it barely scratches the surface.
However, if you’re interested in historical being of different mythologies, this might be of some interest (mostly later in the novel). Some notable existences in the novel include Jormangundr and Fenrir (Norse mythology), Shuten Doji and Ibaraki Doji (Japanese folklore), the four evils/fiends (Chinese mythology), as well as Osiris (Egyptian religion).
Overall, I would recommend a read if you want a longer novel to kill some time. I definitely enjoyed reading it and hope you do as well.