Dusky smooth-hound time to induce tonic immobility in smooth dogfish was 32.5 seconds. The mean duration of the tonic immobility was 61.9 seconds. Sharks that had the “limp” response also exhibited tonic immobility. The “limp” response is a criterion for the onset of tonic immobility. Dusky smooth-hound The dusky smooth-hound ("Mustelus canis"), also called the smooth dogfish or the dog shark, is a species of houndshark in the family Triakidae. This shark is an olive grey or brown in color, and may have shades of yellow or grayish white. Females live to 16 years and males have a lifespan of 10 years.
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