In this Thursday Sept. 20, 2012 photo, a muzzled dog, in a park, where dozens of dogs were killed in a mass poisoning of dogs in a Moscow park. On Friday, Sept. 21, 2012, police opened a criminal probe into the suspected poisoning of animals by dog killers, the latest such incident in Russia where cruelty to animals is common and animal protection laws are rarely enforced. This well-heeled neighborhood has always cherished its enormous park, where they could give their dog a moment's respite from cramped city living and let them frolic without a leash in the grass or in the snow. (AP Photo/Sergey Ponomarev)