Perks: AoC has custom perks for pets, which only grant positive bonuses in Strength, Agility and Vitality. Mounts only get perks in Agility and Vitality.
All non-mount AoC Pets start with the same HP and attributes: HP: 5,703, STR: 5, AGI: 5, VIT: 5, ACC: 0, Surv: 0
Pet attribute growth starts as below and adds 60% randomly between STR, AGI, VIT, in increments of 3%. STR: 40%, AGI: 40%, VIT: 40%, ACC: 0%, Surv: 0%
All AoC Mounts start with the same HP, attributes and growth chances: HP: 5,438, STR: 0, AGI: 0, VIT: 5, ACC: 0, Surv: 0, STR: 0%, AGI: 40%, VIT: 40%, ACC: 0%, Surv: 0%
Non-mount pet growth per stat: Strength: 8.75% Melee Damage Bonus per point, Agility: 34 Armor per point, Vitality: 440.8 HP per point
Mount growth per stat: Strength: 7.5% Melee Damage Bonus per point, Agility: 16 Armor per point, Vitality: 487.65 HP per point
The three non-faction pets below from the Seal of Light feat are always immune to the plague.
Most faction pets require a Metamorphosis skin, purchased from the Guild Vendor for 500 Guild Tokens, to become immune (with a couple exceptions noted below.)
Profession pets require a skin purchased from the Guild Vendor to become immune, unlocked with the level 100 feat of that Profession (with the exception of The Night Scavenger, which is always immune.)
The Undead and Demonic Zephyras Horses are immune and the Zephyras Horse is not and cannot be made to be.
The Vanghoul Grunt also cannot be made immune.