I think you're breaking the fifth law with necromancy, whether you're raising animals, dinosaurs or insects. It's not as bad as humans sure, but it's still bringing something back from the dead.
Also, necromancy by it's very nature twists people (hence lawbreaker). The more you use necromancy, the more you see yourself as being above the petty laws that effect others; after all, you are the master of death itself!
Still, it's not impossible that someone could redeem themselves. Saving lives, restoring the balance of life and death, combating necromancers by unravelling their spells and so forth.