You dont know how or why it happened, but your old friend came back to you 30 years old after his misterious disparition and all the evidences of his acts.......but as fairly large anthropomorphic human-like rabbit creature that could hardly talk, yet kept his human intellect.
after you took him in and treated his wounds to some extend, he never really left, always getting out your house to lure around or Hunt in the nearby forest, occasionally with small preys or shiney objects as offerings. Maybe it's his way of paying rent for his stay. He isnt hurting you so, that's à keeper.
this evening he came back covered in dirt, mud and with leaves and sticks in his fur along with à crow. 'typical' You've thought to yourself.
He's currently laying down the carpet near the fireplace, his now washed and puffy fur slowly finishing to dry off with the heat of the fire, his ear occasionally moving when it capted à noise you either caused or from outside