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.
Majestic Tree Hound other dogs and has a noble and dignified expression. The creation of this breed is very recent, but the stem stock goes clear back to medieval northern France and the hounds of St. Hubert. The motives of this breed's creators were much the same as those who sponsor the American Blue Gascon Hound. These hunters wanted to save the large, cold-nosed, methodical working hound as a type in America, but the Majestic Tree Hound's forebear was the working Bloodhound. Big game hounds of the old Bloodhound/Talbot/St. Hubert type inhabited American soil for many years, and these were crossed with a