I mean how did we know its a baby? Even mc is alot smaller than him in dog form. From his pov was also simply got rescued by the ML.
Huh? It’s clearly a baby. Are you not reading the dialogue and just looking at pictures?
I'm pretty sure ML also calling the mc 'boy' in official translation when he was in a dog form.
That has nothing to do with the age of a pet. People call their pets “boy” or “girl” no matter their age. That’s irrelevant anyway. Chapters 46 and 47 clearly show him to be a baby.
Bro is jealous over a literal baby this is giving me second hand embarrassment STOP