After retiring from the San Luis Obispo Police Department due to a neck injury, 14-year veteran Greg Gallo said he began experiencing flashbacks, nightmares, depression and intense anxiety. “I was isolating myself at home, and then isolating myself in another room from my family,” he said. “I was majorly suicidal.” On Wednesday, Gallo spoke about his experience with a service dog at the Santa Maria Public Library during a presentation by New Life K9s, a San Luis Obispo-based nonprofit that provides service dogs to veterans and first responders with PTSD.