"Does the book say how they feel about that?" Animal companions and familiars are fine, and certainly common in battle. Even trained animals are okay. Throwing the wildlife into cage fighting is dubious. "I can't exactly ask them."

Ilphyl has figured out they can't cast a single spell, which includes all their druidic magic. Of course, they still know how to observe if an animal is unhappy, but it is the principle of the matter. That being a lack of magic.