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All content copyright © 1999 - 2008 CattleDog Publishing^®Sophia Yin, veterinarian, pet columnist for the San Francisco Chronicle, and author of "The Small Animal Veterinary Nerdbook," received her Master's in Science 2001 where she studied barking as communication dogs. has worked with behavior modification many animals including dogs, cats, horses, giraffes, ostriches, chickens, and parrots. currently lectures at various training symposia runs a private practice consult business.