Sir Robin Meets Puca

Of all the dogs we have, Sir Robin (Robin for short) seems to have more of an issue with the cats than any other dog. He is almsot 14, and has never had to share his space until we adopted the other 3 dogs. I think he is still waiting for them to leave. He and Kodie (age 11) have become good buddies, while Chakra (age 7) has a bit too much energy for him. He does tolerate him well. He likes Effie (age 7), but she has no room in her life for him.
Yesterday while sitting on the couch, we noticed Puca in the downstairs hallway. This was quite rare for him as he hardly ever ventures past the stair case. Robin saw him, and immediately started the “stare down”. Puca just watched him carefully. Robin crept closer and closer until he couldn’t take it anymore, and actually charged. After much hissing, spitting, and clawing, Puca ran back up the stairs and assumably under the bed. Robin just walked away with a smug look on his face,?as if he was still the king of the castle.