I have had my jrt for 9 years. He is very aggressive over food and my attention. We recently added a cane corso puppy to our family and they have been in numerous brawls where the Jrt starts them. At first the puppy would run away, but the bigger he is gotten the more he will fight back. Their latest fight resulted in a $700 surgery for the her. And he is still aggressive toward the Cane corso puppy. I want them to live harmoniously. What do I do?