Customers find the book informative and eye-opening, providing scientific facts and insights on human and pet health. They describe it as easy to follow and understand, with thorough explanations. Readers consider it essential reading for dog owners and highly recommend it to animal lovers. The food quality is described as good, wholesome foods that parallel human diets and environments. Many readers praise the authors’ research work and simple yet informative storytelling. However, opinions differ on the value for money and recipes.