Wherever you are, the Treasure Yeti only appears if there’s no other mission active. However, some players report having better success with Treasure Yeti spawns in the Plants Town Center and Mount Steep. Treasure Yetis spawn in random points where no plants are around.
These unique bosses have specific spawn conditions. The Crystal Dog only drops from Treasure Yeti monsters. Manage cookie settings Plants vs Zombies Battle for Neighborville Crystal Dog | Crystal Dog drop and Treasure Yeti To see this content please enable targeting cookies. Getting to that point is a bit tricky, though. If you manage to find and defeat the Treasure Yeti holding the Crystal Dog in Plants vs Zombies, you can exchange it for a cache of coins and an exclusive reward. The Plants vs Zombies Battle for Neighborville Crystal Dog is a rare drop from an even rarer enemy, but it's worth the trouble to find.