Spanish rescue team members with their dogs are seen at the at Colonia Roma in Mexico City on September 23, 2017, four days after the powerful quake that hit central Mexico. A strong 6.1 magnitude quake shook Mexico on Saturday, causing panic in traumatized Mexico City, where rescuers trying to free people trapped from this week's earlier earthquake had to suspend work. (Photo by Pedro Pardo/AFP Photo)





Two Argentinian rescue workers take a break with their sniffer dogs while participating in the search for survivors at a flattened building in Mexico City on September 24, 2017, five days after the devastating quake that hit central Mexico. (Photo by Alfredo Estrella/AFP Photo)





Sniffer dogs take part in the search for survivors at a flattened building in Mexico City in the early hours of the morning on September 24, 2017, five days after the devastating quake that hit central Mexico. (Photo by Omar Torres/AFP Photo)





A rescue dog searches for survivors in Mexico City on September 23, 2017, four days after the powerful quake that hit central Mexico. In the capital, the quake toppled 39 buildings, mostly in a central area with older construction that is popular with tourists and foreigners living in the city, and also in the south. (Photo by Pedro Pardo/AFP Photo)





A rescue dog searches for survivors in Mexico City on September 23, 2017, four days after the powerful quake that hit central Mexico. (Photo by Pedro Pardo/AFP Photo)





A rescuer walks with a dog to search for survivors in a collapsed building three days after the magnitude 7.1 earthquake jolted central Mexico killing more than 200 hundred people, damaging buildings, knocking out power and causing alarm throughout the capital on September 22, 2017 in Mexico City, Mexico. The earthquake comes 32 years after a magnitude-8.0 earthquake hit on September 19, 1985. (Photo by Humberto Romero/Getty Images)





Drago a rescue dog waits with a 47-member group from Guatemala's Search and Rescue team as they get ready at the civil protection headquarters in Guatemala City on September 21, 2017, before heading to Mexico to assist in the humanitarian effort two days after the major earthquake that left more than 230 people dead. (Photo by Johan Ordonez/AFP Photo)





Frida, a rescue dog belonging to the Mexican Navy, with her handler Israel Arauz Salinas, takes a break while participating in the effort to look for people trapped at the Rebsamen school in Mexico City, on September 22, 2017, three days after the devastating earthquake that hit central Mexico. (Photo by Omar Torres/AFP Photo)





Soldiers with specially trained dogs search for survivors amid the ruins of buildings knocked down Thursday night by a 8.1-magnitude quake, in Juchitan de Zaragoza, Mexico, on September 9, 2017. Police, soldiers and emergency workers raced to rescue survivors from the ruins of Mexico's most powerful earthquake in a century, which killed at least 61 people, as storm Katia menaced the country's eastern coast Saturday with heavy rains. (Photo by Pedro Pardo/AFP Photo)





Rescue dogs receive a massage from a volunteer during a break from participating in the search for survivors and bodies in Mexico City on September 22, 2017, three days after a powerful quake hit central Mexico. (Photo by Pedro Pardo/AFP Photo)





Spanish rescue team members with their dogs are seen at the at Colonia Roma in Mexico City on September 23, 2017, four days after the powerful quake that hit central Mexico. (Photo by Pedro Pardo/AFP Photo)





Frida, a rescue dog belonging to the Mexican Navy, with her handler Israel Arauz Salinas, takes part in the effort to look for people trapped at the Rebsamen school in Mexico City, on September 22, 2017, three days after the devastating earthquake that hit central Mexico. (Photo by Omar Torres/AFP Photo)





A rescuer searches for survivors with a dog a day after the magnitude 7.1 earthquake jolted central Mexico killing more than 200 hundred people, damaging buildings, knocking out power and causing alarm throughout the capital on September 20, 2017 in Mexico City, Mexico. The earthquake comes 32 years after a magnitude-8.0 earthquake hit on September 19, 1985.(Photo by Humberto Romero/Getty Images)





Drago a rescue dog waits with a 47-member group from Guatemala's Search and Rescue team as they get ready at the civil protection headquarters in Guatemala City on September 21, 2017, before heading to Mexico to assist in the humanitarian effort two days after the major earthquake that left more than 230 people dead. (Photo by Johan Ordonez/AFP Photo)