Rufus, in his mind, understood that Bunjee was a hunter, and all creatures were in possible danger of attack from him. This was learned behaviour, which came from me; he watched everything I did, and so copied what I did. Telling Bunjee, "NO", was often said by me, and Rufus would stand up and confront Bunjee. But they never fought, for in Rufus' mind, Rufus was the Boss Dog over his brothers, Bunjee and Poly, and his sister Molly Dolly.
Bunjee was a loving, happy little dog, who was able to control his hunting urge when told.
Rufus believed his role, was to prevent Bunjee from hurting animals and birds. Bunjee would not attack the birds when we were all in the garden enjoying food together, and the birds would be having their bath in their bird bath, or picking up crumbs off the ground.
But sometimes in the paddocks, Bunjee may see birds intruding on what he saw as his space, and chase them away, and Rufus would then be on alert, to protect everyone from Bunjee.