Citation: Yamamoto S, Ohta Y, Hasegawa E, Hashida S, Kaneko Y, Mizutani S, Ong BHE, Naganobu K and Torisu S (2019) Usefulness of Urinary Creatinine/Urea Nitrogen Ratio as Indicator of Body Protein Catabolism in Dogs Fed Low Protein Diets. Front. Vet. Sci. 6:449. doi: 10.3389/fvets.2019.0044