Dog meat is considered to be something akin to pork or beef in a few areas of China. One of the most well known areas where dog meat is eaten is Yulin, in Guangxi province. There is a dog meat festival known as the Yulin Dog Meat Festival held in this city every year since 2009.
Between 10,000 and 15,000 dogs were eaten at this festival, which has been actively protested since it started, when it began. In 2015, that number is reported to have dropped to about 1,000 dogs eaten during the ten day festival.
However, considering how poor some Chinese citizens are, it does make sense that dogs might be eaten outside of this festival.