Send us Fan Mail A single ion is changing how we read the story of canine heart failure. We sit down with cardiologist Dr. Darcy Adin and internist–nephrology researcher Dr. Autumn Harris to unpack why hypochloremia—once dismissed as collateral damage from diuretics—now stands out as a powerful predictor of survival in dogs with stable congestive heart failure. The conversation moves from physiology to practice, showing how chloride levels map to renin–angiotensin activation, diuretic resista...