My 16 month female rescue APBT is very protective over my bedroom, my bed in particular. She is very territorial of our home in general to strangers, but to ANYONE who comes into my room. We will be sitting in bed and for example, my brother will come in. As soon as she hears the door she starts to growl. When he comes in, she will stiffen up and bark, sometimes fly off the bed and bark towards him, lunge at him, she has even jumped up and nipped at him. But then there are times where he ignores her and makes his way onto the bed and lays down and she starts licking him and snuggling like it's fine, rolls onto her back and shows her belly in submission, despite all the barking she did. Even if she is not already laying on the bed, say she is laying in her crate and someone comes in the room, she will start barking and run and jump on the bed to protect it. I don't know if she does this because there have been plenty of times I have gotten annoyed/angry/raised my voice at my brother for just letting himself in my room, and she picked up on that? Maybe she associates someone coming in as bad and is just trying to protect me/my bed? I don't know what to do about this. She is a very sweet, affectionate, mellow dog otherwise. Very anxious though and has separation anxiety from me. She's very sensitive. Please, any pointers?