Okay so I read this in like 2018 and I remember roughly the plot so let's go.
The protagonist is kinda of a soul I think, basically they start of with no body and no memory inside a dungeon, then they discover they can inhabit the bodies of monsters, so they become a wolf who helps adventurers in the dungeon, eventually he is hunted down and killed and become a bird, i think(?), he then goes on some adventures with a guild as the bird. I think he becomes a young aristocrat girl's dog later, but that's not very clear in my memory. The only thing I'm 100% sure on is the bit where he is a wolf that helps adventurers.
I'm honestly just really curious what happens so if anyone has any ideas please throw them my way
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list here consists of-
Isekai - when mc gets transported to another
reincarnation - when mc get reborn with memories of previous life
time travel - when mc travels distant past/future
Transmigration - when mc posses a body of another person
regression - when mc goes back 2 their early past years
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