Of the top of my head I recommend reading https://www.mangago.zone/read-manga/shiba_inu_rooms/
And also https://www.mangago.zone/read-manga/ojisama_to_neko/
They're both slice of life. The first one has some fantasy elements and focuses on MC with their dog. The second is pure slice of life with the changing viewpoint between MC and the cat. Although they sometimes do interacts with other ppl. Overall both are really cute and has emotional scenes.
mc is kinda had stoic face and he live with the cats alone. well at some point if you're preferring comedic story i think this one is good
https://www.mangago.zone/read-manga/taro_miyao_becomes_a_cat_parent_official/
Ay you're welcome those are some of my current fav mangas. As long as I get someone else interested in these peak mangas it's worth it
I also recommend https://www.mangago.zone/read-manga/fushigi_neko_no_kyuu_chan/
Very cute and wholesome cat life.
Or https://www.mangago.zone/read-manga/maru_is_a_puppy/
This one is about a dog turned human and the MC raises her like a little sister. It's a bit different from the others I recommend but it's wholesome and just barely completed.

Does anyone know a story where the mc have a personality/attitude of being aloof, stoic like rather than having an eventful life she/he instead prefer live alone or like with an animal.