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1) PFMA Obesity Report (2019) https://www.pfma.org.uk/_assets/docs/White%20Papers/PFMA-Obesity-Report-2019.pdf
2) Kealy, Richard D., et al. "Effects of diet restriction on life span and age-related changes in dogs." Journal of the American Veterinary Medical Association 220.9 (2002): 1315-1320.