The one every pet starts with right after you tame MapleStory Mesos players.
Pets have feelings too, and the happier your pet is the better off both of you will be. The more content you keep your pet the more inclined it will be to work for you. Your maple story mesos pet has three different levels of happiness.Unhappy is the lowest state and the one every pet starts with right after you tame MapleStory Mesos players. While unhappy they only cause 75% of their regular damage and lose loyalty. If you keep them unhappy too long they will eventually run away!Unhappy is marked with a red frowny face next to your pets' portrait. The second level of happiness is contented. This is a middle ground where your pet deals 100% damage and slowly gains loyalty. This is marked with a yellow smiley face.The final level is happy, marked with a green smiley face. At this level your pet causes 125% damage and gains loyalty very quickly.