Cockerels can turn out well, or not. It's a combination of genetics and how they're raised. Your boy may never get along with your dog; either they work it out; and that's more about your more trainable dog, or they need to be separated.
Also, those 'friendly', hand fed, disrespectful cockerel chicks, are likely to develop into human aggressive jerks as they mature, and no bird who attacks a child should be allowed to stay!!! My cockerels are expected to move away from me at all times, and never think bad thought about any human. It's just not acceptable! Mary