Brock doesnt dislike anyone. However it seems he has a particular love for dobies, boxers and other aussies. Oh and he goes CRAZY for mini aussies. There are 3 or 4 regulars at marymoor and anytime one of them is there he will NEVER leave it alone. Even when I drag him away he ends up finding them again. I think its because they are so tiny, hyper, fast and yappy. lol