Hi there, my brother has a mutt, she is about 4 yrs old. I can't do much for training her as my brother is quite the stubborn person. He is truly unique in that way. Couldn't understand unless you knew him. Anyway, his dog is a very nice dog. Mostly. She has been around kids her whole life, she knows how to act around a baby to a toddler to an older kid. She diferentiates between them. So when she had puppies, we took one. He will be 2 in august.(We have a 3 year old and a 4 month old children) He is just like his mother. However sadie has shown a new side to her lately. She can be quite agressive while playing with some people for lack of better words. The other day she nipped his neighbor. He was shoveling and she was excited, so she nippesd him when he came in the yard. Like she nipped my husband in the butt when he riled her up knocking snow off the roof. We were outside sitting on my deck the other night, and my cat was on top of my chair and sadie was trying to get her. She was climbing on me and I tried to tell her get off and give her a little nudge and she growled at me. Now she is a bully looking dog, medium sized, and even though I've known her all her life it was intimidating. After she growled at me that was all I was having from her, got up and shoved her off my chair and off of me. She bit me in the process. How should I be reacting to this? Seems to me she thinks she's alpha, and I'm not sure how to compose myself to show her she is not alpha over me. And how do I keep our dog, her son from acting like this? He takes after sade a lot. Just socialising, dog classes and such?