Board Thread:General Discussion/@comment-26955524-20161126192429/@comment-4010415-20170226215941

Animals do, indeed, feel negative emotions. At least, it's certain that mammals do, anyway. Otherwise, they wouldn't be able to develop PTSD or separation anxiety.

And yes, mammals can have PTSD. I've actually seen a case where a cat had PTSD that its brain connected with the family's child. One day, they were outside, and as the child reached out to pet the cat, a car backfired, scared the crap out of the cat, the cat thought it was in danger and thought the child caused it because he happened to be reaching for the cat at the time, and from then on, whenever the child reached toward the cat, the cat became terrified. They had to have a cat trainer help them get the cat over its PTSD so it wouldn't be a danger to their child anymore.

Anyway... Qrow did, indeed, say that the Grimm were created because life, in general, kept returning, despite the Darkness god's attempts at destroying plants, animals, and water.

"To counteract his brother's creations, the god of darkness brought drought, fire, famine, all he could do to rid Remnant of life. Life always returned. So one night, the younger brother went and made something - something that shared his innate desire to destroy anything and everything.

Ruby: The creatures of Grimm."