Ghost of Tsushima will receive a major update next week with the addition of co-op and New Game +. With the latter, in addition to the next merchant and other things, it will be possible to get a dog.
You can summon a pet as a spirit in Legends mode. The co-op can be accessed from the menu or by talking to storyteller Gezen in town. The character will open the gates to the world of the stories he created and tell his legends.
In addition, a new ghost flower merchant will appear in the game, but only in the “New Game +” mode. Title owners will receive the update for free, but Legends will have to be opened separately through the PS Store.