Gramps

Gramps is an old wolf that lives in an island city that is generally abandoned by humans until a train makes a stop for its passengers or supplies. The train provides work for many of the wolves on the island, including Gramps. He is the eldest known member of Zali's Pack.

Gramps is a helpful if not moderately friendly wolf in an otherwise unwelcoming pack. He is very willing to answer the questions of Kiba's pack, even showing them the entrance to the tunnel that supposedly leads to Paradise. He himself is not one to question how things work and is willing to accept life as it is, whether it leads to difficulties or not.

He is a hard worker and, likely due to his age, seems to be a bit of a loner. He is willing to work as hard as it takes to surive, and is resigned to the fact that death will reach him eventually, even going as far as to dig his own grave.

Wikia