That is pretty good. I used to let my dog play fetch with my brother's 105 pound staffy until the staffy pushed her over one to many times; she sprang up off the ground, forgetting about the ball, and looking to kick some butt. Fortunately, I separated them before anyone got hurt. When two strong willed dogs compete for the same object, they can escalate into an altercation quickly. Cool they can play together like that though.