Excalibur, the dog of the Spanish nurse who contracted Ebola, barks from her apartment's balcony in Alcorcon, outside Madrid, October 8, 2014. Madrid regional authorities said they would euthanize the nurse's dog Excalibur to avoid possible contagion, sparking an outcry by animal rights activists to save the dog. Spanish health authorities said on Wednesday that another person being monitored in Madrid for Ebola had tested negative for the disease. The man, a Spaniard who had travelled from Nigeria, was one of several people hospitalised after authorities confirmed on Monday that the Spanish nurse had caught the disease in Madrid. REUTERS/Susana Vera (SPAIN - Tags: HEALTH SOCIETY ANIMALS)