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.
Trigg Hound Rainey returned from his trips, however, he announced that the Triggs were the "best and most courageous hounds in the world," causing their popularity to rise again amongst hunters. Male Trigg Hounds stand at the withers and weigh , while females stand and weigh . The variety has a long snout, hanging ears, and a short, smooth coat, and though it may come in any color, the Continental Kennel Club allows only tricolor and bicolor dogs. The Trigg Hound is obedient but "tenacious", and is well-suited to hunting because of its sense of smell and endurance. Trigg Hound The Trigg