Oy is a dog (or canine species) that Susannah Dean, Eddie Toren and Jake Toren, will mostly likely adopt, according to Stephen King in the "Coda" section of The Dark Tower. He is described as "having a long neck, odd gold-ringed eyes, and a bark that sometimes sounds eerily like speech". This will make the Ka-tet of the Rose complete, once again, save Roland Deschain.