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Part I. A Paradox: 1. Of pigs and pets Part II. The Case Against Pets: 2. Substitutes for people 3. Instruments of follie 4. Pets in tribal societies 5. A cuckoo in the nest Part III. An Alternative View: 6. Pets as panacea 7. Health and friendship 8. Four-legged friends Part IV. Exploitation and Sympathy: A Conflict of Interests: 9. The myth of human supremacy 10. Killer with a conscience 11. Licensed to kill 12. The fall from grace.
Anderson et al. (Fri,) studied this question.