Dogs look over a fence while standing on the ground covered in ash from Calbuco volcano in Ensenada

Dogs look over a fence while standing on the ground covered in ash from Calbuco volcano in Ensenada, April 23, 2015. Volcano Calbuco in southern Chile that erupted unexpectedly on Wednesday was still pouring ash into the sky on Thursday, forcing the cancellation of flights from nearby towns in both Chile and neighboring Argentina.The volcano, which last had a major eruption in 1961, has blown a spectacular plume of ash and smoke nearly 20 kilometers into the sky near Puerto Varas, some 1,000 kilometers (625 miles) south of Santiago. REUTERS/Carlos Gutierrez TPX IMAGES OF THE DAY