Some ideas could be:

1. Actually use ferocious animals or creatures instead of rabbits or the barnyard goat lol
2. Possible weapons that would be suitable such as a whip, a pole, a mace, an one-handed axe
3. The role would most likely be dps but i have to admit it would be interesting to see a main tank pet class for variation( if even possible)
4. The pets would level up as your job does and learns new abilities through job quests.
5. The pets could wear barding for enhancements.