I have 2 rotties, both American breed, Pavlov was acquired through the animal shelter at 1.1/2 with a full tale and has grown (overgrown) to 150. I was so in love with him, that I bought Nadia, who has been docked. Presently he is about 5,and she is about 8months. Pavlov started getting dog to dog aggressive at about 2. However off his leash he gets along with all "the guys" in the neighborhood. Nadia is still developing her personality, she lilkes to sleep right next to me at night. They covort (when they're not sleeping ) but she will go after his tail., and legs and ears ad nauseum. He has never bit her but after a couple times he's hadit and nipped her. She licks him continually and between both of us we're his surrogate parents. He is loved throughout the neighborhood and by all the workers I've had in my home. She is still discovering her comfort zone, and also her protective instincts. Though she has no where near the broadness of body, she is still developing and is as tall as he his. I no longer try to sit on my own couches.