Mustelus Canis, also known as the smooth dogfish or smooth-hound shark, is a species of shark that belongs to the family Triakidae. It is a small, slender shark found in the coastal waters of the western Atlantic Ocean from Canada to Argentina, including the Gulf of Mexico. This species has multiple synonyms, including the following: smooth dogfish shark, greyhound shark, Atlantic smooth-hound, common smooth-hound, among others. Although it is a common species, its population has declined due to overfishing, and it is now considered a threatened species. The smooth dogfish shark is an important species for commercial and recreational fisheries.