The Good Doggos turned out to be the lackeys of the Bad Doggo!
Every Worldboss got replaced by [Reincarnation of pure Evil] Bad Doggo, which spawns at the usual times in north Flaris, next to the Aibatt spawn.
Killing the Worldboss grants the same rewards as usual.
There are new Achievements for killing Good Doggos and [Reincarnation of pure Evil] Bad Doggos.
Both Achievement types grant new Items that both can be used to craft a new Pickup Pet and a new Badge.
You can access the Crafting System in the menu. Start -> Features -> Crafting, inside the "Event"-tab
The event will continue to last until january the 19th.