Harper's has a translated excerpt from a 1942 letter detailing a list of recipes used by the residents of Leningrad during the city's blockage by the Nazis in WWII (subscribers only). In addition to mustard cakes and leather-belt soup, here's this:
Soup from pets and domesticated animals
Meat is ranked by taste in the following order: dog, guinea pig, cat, rat. Gut the carcass, wash well and place in cold water. Add salt. Cook for one to three hours. For aroma: bay leaf, pepper, any sort of herbs, and, if available, grain.