Laurie McCannon, director of the Northeast Animal Shelter in Salem, Mass., with a dog named Trina. Three-quarters of the dogs adopted from the shelter in 2013 were from out of state. Shannon Mullen for NPR hide caption

itoggle caption Shannon Mullen for NPR

Miami-Dade County's animal shelter takes in more than 28,000 dogs and cats each year. In 2012, the county adopted a resolution that the shelter would become a no-kill facility. But even no-kill shelters can euthanize up to 10 percent of their animals. Greg Allen/NPR hide caption

itoggle caption Greg Allen/NPR