Not sure if this is intended or not, but "correct" Player UUIDs aren't present in their Datatag. What I mean by "correct" UUID is that the UUID that appears in UUID look up sights and OwnerUUID tags of pets match none of the datatag in a player. Taming wolves etc alters their OwnerUUID to match the players UUID found on look up sites but there's no clear way this is achieved.

If this is intended, adding the "correct" UUID would be very useful for mapmakers to spawn pet that are automatically tamed via

/execute store . . . data get . . .