Thats one thing I love about my Remus boy, he's always been a fatherly type to even temporary residents of my home. It takes a LOT to make him angry (I've only seen him hiss maybe four times in his life), and he isn't afraid of getting hissed or griped at. He'll just sit and let a kitty hiss at him (Spook being a prime example lol) and not even budge. He knows they'll run out of steam eventually!