User blog comment:Lux capacitor/Possibilities In RWBY - Animals/@comment-8182065-20141014023356

Depending on the animal and how well-trained it is, I'd say it has potential just to use Dust in some sort of way, but not becoming a full on master in all areas. Example: a dog using Lightning Dust to give its fangs (Zwei learned Thunder Fang) or claws an electricity buff. Every living thing has Aura, including animals, so it just would depend on the training and species honestly (not to mention the fact that we need to see a well-trained fighting animal in action first before it can become a thing).

Define creatures besides Grimm?If you mean other animals, then of course there's most likely going to be more types of animals and insects, though we don't know if they'll come in normal form (rabbit, cow, fish) or go with a fantasy type thing (rappig, platypus bear, chocobo).