Dusky smooth-hound fishes is their ability to continually replace the teeth in their upper and lower jaws. Smooth dogfish differ from other sharks because of their 10 rows of flat, blunt teeth. The teeth in the upper and lower jaws are similar in size and are asymmetrical with rounded cusps. These teeth are used to crush and grind food, rather than bite it. Their unique dentition is important for their crustacean-based diet. In smooth dogfish, tooth replacement is related to body growth. They grow about 10 cm per every six rows of teeth replaced. That is an increase of 0.03 mm per
German Hound German Hound The German Hound ("Deutsche Bracke") (FCI No. 299) is a breed of dog originating in Westphalia, a region of Germany. The German Hound is of the scenthound type, used for hunting both large and small game. The breed is normally referred to as the "Deutsche Bracke" in English, rather than by the translation of the name, German Hound. The German Hound is a small hound, 40 – 53 cm (16 - 21 ins) at the withers, with long, drooped ears and a long, narrow tail. It is distinguished by a long, somewhat narrow head, and a rectangular body,