The model is finished, and all we need to do is use TenPlus1's mob API to bring our creation to life.
Download the .b3d exporter here.

I've started a mod that will bring several farm animals into the game, the dog is included, you can download it here.

Also, the reason the dog wouldn't attack me is because I spawned it, any animal that you place in the world with a spawn egg registers as being a tamed/owned mob, so they won't attack you if you attack them. The code I'm using is correct for anything that naturally spawns, they will attack.