Author Jonathan Couch (1789–1870)
English: Picked Dog
Picked Dog and Youth Spur Dog Bone Dog Hoe Skittle Dog Dogfish Galeus acanthus gazae Squalus acanthias Squale aiguillat Common dogfish Acanthias vulgaris
Subject: Spinax, Spiny dogfish
Tag: Fish
Date 1877
Source/Photographer
English: Couch, Jonathan (1877) History of the Fishes of the British Islands, London: George Bell & Sons
Source: https://commons.wikimedia.org/wiki/File:FMIB_46042_Picked_Dog.jpeg

The spiny dogfish, spurdog, mud shark, or piked dogfish (Squalus acanthias) is one of the best known species of the Squalidae (dogfish) family of sharks, which is part of the Squaliformes order. It is found mostly in shallow waters and further offshore in most parts of the world, especially in temperate waters.