Why do dogs eat their masters are generally hounds that survive in the wild

The reason why dogs eat their masters dogs are descendants of wolves, a television program about dogs said that if the master died, once the dog lost the source of food will write to any meat around, as a way to help themselves for the purpose of survival will appear, but not because the master was not good to the dog in life, will be eaten by the dog after death, the real situation is that generally in life the master and the dog are very close relationship, but in contemporary society is generally not this situation, are occurring in the body of the hound.