Dog fish belongs to the class of ______.

Dog fish (Generic name - Scolidon) also known as small shark belongs to class- Pisces (fishes). They are exclusively water living. Their skin is covered with scales or plates. They obtain oxygen dissolved in water with the help of gills. The body is streamlined and a muscular long tail is used for movement in water. They are cold-blooded and have two-chambered heart. They lay eggs (Oviparous).