Extremely rare. Greatly increases pet experience and assures rewards.
How to get[]
These are extremely rare Pet food resources obtained by opening Treasure Chests, sometimes as TradeFest and TradeFest bonus tier rewards, the Magical Tower, the Wicked Witch’s Hut, the Croaking Spring on Wishing Wellspring Island (Wish of Friendship or Fate), Dock Trades or by feeding your pets.
Uses[]
They are used to feed your pets to increase relationship level by 250 (rank 1), 1500 (rank 2) or 4000 (rank 3) and guarantees a reward.
See here Pets and here Pet Sanctuary for all info on nap time, feeding, rewards and more.