1. Japan Pet Food Association URL: https://petfood.or.jp/data/chart2022 /index.html.
2. Ministry of the Environment URL: https://www.env.go.jp/ nature/dobutsu/aigo/2_data/statistics/files/r03/2_{31}.pdf.
3. Japan Pet Food Association URL: https://petfood.or.jp/data/chart2011/01.html.
4. Ministry of the Environment URL: https://www.eva.or.jp/gyakutai2022.
5. Sequence analysis of domestic dog mitochondrial DNA for forensic use;Savolainen;J. Forensic Sci.,1997