How can you differentiate between listens to and hears? Or is there no difference in vietnamese? In english there is a difference in intentionality. hearing is passive while listening is active.
I would suggest that tiếng con mèo could also be translated as meowing.
Cats can make more sounds than just meowing, so I think that might be quite a different translation.
I think you are right as the "tiếng" suggests to me that it is the cat's voice that is heard rather than noise created by other means.
Kuah dear u speak cat so well that next time my cat tries to say sth i will call u
Last time this sentence came up the was no "tiếng". Now there is. clap clap duolingo