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
Hound trailing the old Talbot tans, while they later acquired a certain infusion of pointer blood ... in order to make hounds carry their heads higher." He further states the "fell hound is the antithesis of the Peterborough type. Instead of size, weight and power, we have lightness, activity, and pace, coupled with wonderful stamina..." In his "Hounds of the World", Sir John Buchanan-Jardine stated the fell hound was descended from the "Chien Blanc", a French hound that shares a common ancestor with the Poitevin, a scent hound known for its speed. Later harrier blood was introduced. In 1919 a Windemere Harrier