The pit-bull of otters. Very powerful and can get to six feet in size. Fearless, as they belong to the weasel family and that includes the powerful Wolverine. River Otter have attacked people and dogs so always caution around our Canadian River Otter. There are 13 types of otter and all are declining in number...Except for the River Otter. You can imagine the strength in the hands and feet of this 60 pounder. Never tease a River Otter. Respect for safety!!