I too think it is a bully thing... but when you talk about getting a friend, I think its is a good idea. I had my nonEB and he was a terror and then I got Toby and they are inseperable now. As Toby and Rocky have gotten older they are both 3 now and I often think that Rocky keeps Toby young. Rocky is part lab and I was told labs don't get out of the puppy stage until they are 3 or more. These two play like when they were younger just not as long now. I know gettting a friend helped my nonEB and I think my bully is better off with a friend too. But the tenacity is definately a bully trait, we call it around "not listening with our ears." Sometimes I would look at Toby and think how do you correct that adorable face.