Dramatic behavior changes marked 2-year-old Gina's return from battle in Iraq. The normally happy German Shepherd was fearful and withdrawn, leading a military veterinarian to diagnose the dog with post-traumatic stress disorder. "There is a condition in dogs which is almost precisely the same, if not precisely the same, as PTSD in humans," said Nicholas Dodman, head of the animal behavior program at Tufts University's Cummings School of Veterinary Medicine.

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