Any pet not listed within this guide, does at the moment not have any effects.
Hoof pet: 10% droprate if you're under 5,000 NPC Kills, 5% otherwise.
Evil Hoof pet: 10% droprate under 5000, 7% under 10000 but over 5000, and 5% otherwise.
Vorago Pet: 10% chance to deal your max hit on next hit
Prestigious Pet: 10% chance to deal your max hit on next hit (Every hit). 5% chance to deal triple damage on next hit. 1% drop rate for every 4 Prestige. Increases your chance of dodging incoming damage by 5%. Special recovery is increased by 50%.
Ninja Pet: Thieving will be 100%