<human>: Hi guys

Last Thursday I got a new dog. Her name is Blue. We got her from a local man who took the dog away from her drug abusing, dog abusing brother who made money from the dog (breeding). She's a gorgeous, 5 year old Blue Staffordshire Bull Terrier and is the sweetest dog I've ever met. [pic](

However, we have another dog called Billy, he's a white and brindle Staffordshire. He's been with us ever since he was a puppy and he's 9 years old now. He's been here forever and we've known him long enough. He's soft, harmless, lazy and old but he's so god damn cute. [Pic of Billy](

Blue doesn't show any signs of aggresion towards humans. She's happy, full of life and indeed very cute. However, she "went" for Billy on Saturday evening and bit him. Not playfully, she didn't draw blood but it was an attack, not a playful one. He yelped and we put Blue in her cage. We told her it was naughty and then set her free again.

Now on 19/01/15, about 5 hours ago, she attacked Billy again. This time, she went for his neck and really sunk her teeth in. It happend out of nowhere. There were 3 in the living room with Billy at my feet and Blue on the other side of the room. We gave both of them treats and then hell broke loose. Billy grabbed his treat and then Blue came over, curled her lip, growled and then attacked Billy. She caught him on the neck and on his ear. He yelped in pain, it was horrible and frightening. My brother got caught on her, trying to prize her jaw from him. 

We have to re-home Blue because she's new here and has attacked Billy twice. This is not on, it's a horrible thing to do and I don't want her to go but it's gonna have to happen. Luckily we've already found a home for her. So, my question is; is Blue jealous? Is she dominant?

Could you distill the essence of the text into 1-3 sentences?
<bot>: My dog, Blue, attacked my other dog Billy twice. Billy isn't horrible, he's soft and loving and he didn't do anything wrong. Is Blue jealous of the attention? Is she jealous of him?