I have owned a Rotti, my RB Natasha. She was one of the best dogs I have ever had the honor of having in my life. She was extremely large for a female, at her healthiest weighing 125 to 130lbs. She was raised with two Cocker Spaniels and thought she was there size, she was indoor/outdoor, she slept inside and she liked to be outside with the cockers for a while. she was so gentle and loving and i could just go on and on about her. But we had never had one before so we asked the vet how to handle her, she told us to socialize her, be very loving and gentle with her, not to rough house too much, due to her size and lack of knowledge with it, she might become to rough. She never in all the years we had her, growled or acted mean towards anyone. It is in how you raise them and how you treat them, it is nothing about them in particular.