HP and periodontitis: 2018). In that study, the increases in haptoglobin were more dramatic than the ones reported in our study. This can be explained by the differences in the severity between the two diseases. In our study, cats with gingivitis without clinical evidence of periodontitis or stomatitis were included as opposed to the previous study, which included cats with chronic gingivostomatitis (Polkowska et al. 2018).