@tripu some pets develop a sense of security in such environments, some others could care less. To classify all pets as having the same emotional and psychological balance is a strange thing to do. As noted above, I think it's cruel to entrap humans into social structures in which different classes of humans have an authority determined by a region collectively controlled by previous subsets of humans.
@tripu human beings are animals too, and we adapt ourselves albeit more of our environment than ourselves, to certain cultural situations, much as many other animals can do as well and be content via acclamation. Yeah yeah yeah we shouldn't have a crocodile as a pet, but if it's done by correctly replicating it's environment in an extremely large apartment the crocodile should be happy enough or at least content.
@skanman
My heuristic is: only animals that would live “naturally” in an apartment, or those that have been modified for centuries by humans specifically to live in their homes, would live well in an apartment. In the former category: flies, spiders, cockroaches, mice, rats, ants… In the latter: some breeds of cats, perhaps some breeds of tiny dogs, perhaps some rodents other than mice and rats.
Most dogs? Probably not — especially large ones. No birds, no reptiles, no amphibians…
Not sure what the shortcomings of the structure of our human society have to do with this, tbh.