Elevations of cTnI have been reported in dogs with cardiomyopathy (median 0.14 ng/mL, range 0.03–1.88, n = 26), mitral valve disease (median 0.11, range 0.01–9.53, n = 37), and subaortic stenosis (median 0.08, range 0.01–0.94, n = 30) [7]. Here, TNNI3 is linked to mitral valve disorder.