Siberian Tiger, but a vegetarian one at that, feasting on nuts and berries... I don't think I could ever follow their diet or any carnivorous diet...
And yes, I would like to be well away from any ruthless humans, too.
I'd say one of my dogs, but they are both females so I would have to cross genders there. And they don't know any male dogs, so that would bite.
So maybe a dolphin or porpoise would be cool, or an otter. They seem to have lots of fun all the time.