Dogs are altruistic to humans because humans hijacked dogs' kin recognition systems
Dogs are altruistic to humans because we've hijacked their kin recognition systems. Ancestral enemies cats and dogs are much less mean to each other if around each other a lot while puppies and kittens. Perhaps species that have evolved toward greater neoteny also carry along in with that development a longer set of developmental/critical periods for the psychological identification of kin members. If there has been developed a scale for neoteny, I wonder to where cetaceans rank. Common folklore seems to be that porpoises (or is it dolphins) have rescued many drowning sailors.
from "Re: Brotherhood of warmblood"
Quoted on Wed Mar 11th, 2015