While it is considered abhorrent in the U.S., the practice of eating dog meat is culturally acceptable in other parts of the world. Just like cows, chickens and pigs in animal agriculture industry, dogs are raised on farms and treated like livestock. The conditions on many of these dog farms are just as deplorable as your modern factory farm; dogs are kept in small cages, deprived of proper food and medical care, and subjected to a life of stress and pain.
Thankfully, there are many organizations working to change cultural perceptions of dogs. Most recently, Humane Society International (HSI) helped a dog meat farmer shut down his business and transition to non-animal agriculture. HSI rescued 57 dogs from this facility, all of which are now in the U.S. looking for forever homes.
Seeing the dogs before and after rescue is nothing short of amazing. Good luck in your new homes, pups!