WoW:API GetPetHappiness

Returns the pet's happiness, damage percentage, and loyalty gain rate.

happiness, damagePercentage, loyaltyRate = GetPetHappiness();

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Returns:

happiness (integer) - the numerical happiness value of the pet (1 = unhappy, 2 = content, 3 = happy)

damagePercentage (integer) - damage modifier, happiness affects this (unhappy = 75%, content = 100%, happy = 125%)

loyaltyRate (integer) - the rate at which your pet is currently gaining loyalty (< 0, losing loyalty, > 0, gaining loyalty)