Comment by jasdi

Animal domestication is really wild. So we first select for neoteny (playfulness, dependency on caregiver, physical features people like) basically prolonging the juvenile state. Then we put them in controlled environments of abundance, were all their needs are met. Which further diminishes need to reach adult state (with traits like aggressiveness to compete for resources). This abundance causes them to mature/breed earlier and reproduce more than in the wild. Basically a population of children that can produce children. Then we want this population of children to live longer.