The “dog days of summer” are traditionally considered the hottest and most humid stretch of the season, running from July through August. The phrase has ancient roots, tied to Sirius, the “Dog Star,” which appears in the constellation Canis Major. While Sirius doesn’t actually cause summer heat, the expression has remained a fitting description for those sweltering days when staying cool and hydrated becomes especially important. During this part of summer, hydration is important ...