[–] Null0000 0 points 2 points 2 points (+2|-0) ago (edited ago)
Friends are probably a byproduct of the pack mentality. Individuals working as a group are more efficient than individuals working separately.
Love for pets, might have come from the fact that we have been living along side wolfs->dogs for tens of thousands of years in a codependent relationship. We also anthropomorphize a lot of things that are not even living, so its not that much of a stretch that we do it to living things as well.