The star colloquially known as the "Dog Star" is Sirius. Sirius is the brightest star in the night sky and is located in the constellation Canis Major, which represents the Greater Dog. Due to its prominence and association with the constellation, Sirius is often referred to as the Dog Star. It is visible from most parts of the Earth and has been observed and revered by various cultures throughout history. In addition to its cultural significance, Sirius is also a binary star system, consisting of a brighter star (Sirius A) and a faint companion star (Sirius B).