I will take a famous paragraph from J S. Mill as a starting point for defending the idea that moral philosophy has to take charge definitively of those who have been less fortunate in the natural lottery. This means that we must to take seriously the possibility of increasing the capacity for the well-being of nonhuman animals. The aim of the text is to show the relevance of the current ethical debate on enhancement also in the context of reflection on (...) our obligations towards sensitive non-human animals. (shrink)