When his 11-year-old Lhasa Apso, Fergie, was diagnosed with lymphoma, a deadly cancer, Dr. Steven Eisen decided not to rely on standard veterinary care but to apply his own specialist expertise to the case and to treat his dog holistically. He knew from his prior research that a skillfully tailored diet, plus natural supplements, would often achieve cures without the downsides of conventional medicine. His instincts were validated: Fergie was restored to health, confounding her vet's prognosis that she would live no more than "six weeks" by surviving for almost "two and a half years" and...