With a deep freeze approaching, an animal shelter in Krakow sent out an urgent appeal to people to adopt or at least temporarily shelter some of its dogs until the dangerous cold spell passes. The result of what it called “Operation Frost” took the shelter workers by surprise. The KTOZ Shelter for Homeless Animals sent out its appeal on Friday as temperatures were forecast to fall to around minus 20 degrees Celsius (minus 4 degrees Fahrenheit) in parts of southern Poland, where Krakow is located.