Deary because it grants +10 STR and +10 DEX as well as +15 STR, DEX, and INT as Arcane ability.

Other pets:
Ribbit (Warrior)
Loki (Warrior)
Jack (Rogue)
Horton (Rogue)
Granite (Rogue)
Alejandro (Sorcerer)
Frost (Sorcerer)
...