No one knows exactly when the Vietnamese started eating dog, but its consumption – primarily in the north – underlines a long tradition. And it is increasingly popular: activists claim up to 5 million of the animals are now eaten every year. Dog is the go-to dish for drinking parties, family reunions and special occasions. It is said to increase a man's virility, warm the blood on cold winter nights and help provide medicinal cures, and is considered a widely available, protein-rich, healthy alternative to the pork, chicken and beef that the Vietnamese consume every day