Dog meat (Chinese: 狗肉; pinyin: gǒu ròu) has been a source of food in some areas of China from around 500 BC, and possibly even earlier. Researchers in the Royal University of Technology theorized that wolves in southern China may have been domesticated as a source of meat.[18] Mencius, the philosopher, talked about dog meat as being an edible, dietary meat.[19] Dog meat is sometimes euphemistically called "fragrant meat" (香肉 xiāng ròu) or "mutton of the earth" (地羊 dì yáng) in Mandarin Chinese and "3-6 fragrant meat" (Chinese: 三六香肉; Cantonese Yale: sàam luhk hèung yuhk) in Cantonese (3 plus 6 is 9 and the words "nine" and "dog" are homophones, both pronounced gáu in Cantonese. In Mandarin, "nine" and "dog" are pronounced differently).