Looks like it is best if I don't comment Thraw classes before I have read the book. 
I will think more about those possible animal skills, too.
Pack Animal: The animal instinctually coordinates its attacks with other pack members. In a multiple combat, the animal may always support a friendly model's attack, even if an enemy model is in base contact with the animal.
Fetch: The animal has a nose for gold. The animal may now carry treasure but must transfer the treasure to a non-animal member of the warband before the treasure is removed from the table; otherwise, it is assumed that the animal has hidden and buried the treasure. The transfer counts as one of the animal's actions, and the recipient may not make a move action for the remainder of the turn after receiving the treasure.
Slavering Jaws: The animal is naturally aggressive, or has been specially trained to attack. The animal receives +1 Fight.
Guard Dog: The animal is more than just a pet, it's family. If a friendly model within 1" of the animal is hit by an enemy attack (melee or missile), the animal may attempt to intervene and take the hit. To do so, the animal must roll a D20 (+ Fight) and beat the enemy model's score. If the animal succeeds, it takes the hit but takes double damage; otherwise the animals (noble) attempt of sacrifice fails and the initial model takes damage as normal.