Symptoms of post-traumatic stress disorder include addiction problems, nightmares and aggression. Soldiers can struggle with these ills along wiht guilt and shame, and the German Defence Ministry is funding a project to measure whether horses can help them heal. Grooming them can be deeply soothing, says one former fighter. One of the latest stories from the dpa trends & features desk explores the way animals are sharing the burden of trauma. Allison Williamsdpa trends & features\———————– TOP FEATURE Traumatized soldiers find solace grooming horses in the Black Forest Some Germa…