With tragedies, sometimes there are silver linings. When an EF-5 tornado hit Greensburg 10 years ago, a large number of animals were displaced when 95 percent of the Kansas town was destroyed. Sadly, not many of the pets were reunited with their owners.   That disaster brought to fruition, however, an idea that had been considered by several Kansas veterinarians a few years before: a statewide animal response team, or what Wichita vet Dr. Christen Skaer calls a “doggie and cat Red Cross,” to respond to catastrophic events that impact humans and their pets.