Grieving the loss of a loved one—whether human or animal—is not only permissible, it is essential.
Animal Wisdom: Learning from the Spiritual Lives of AnimalsWe are built to be effective animals, not happy ones.
The Moral Animal: Why We Are the Way We Are: The New Science of Evolutionary PsychologyPeople are beginning to see that the first requisite to success in life is to be a good animal.
Herbert Spencer