A stray dog looks out of his enclosure before being castrated in Sofia
A stray dog looks out of his enclosure before being castrated in Sofia, March 29, 2011. "Four Paws", an international animal welfare organization, has launched a four-week campaign in the capital Sofia to castrate stray dogs, as part of the municipality's efforts to reduce their population. The sticker reads, "Four Paws". REUTERS/Oleg Popov (BULGARIA - Tags: ENVIRONMENT SOCIETY ANIMALS)