As a fellow dog lover and owner of a beautiful 8 year old female rottweiler, I don't know what I would do if anything happened to my little baby girl. She sits by my side every day and night and would never let anything happen to me. Love that dog so much.
Dogs are amazing animals. Brutus was lucky to have you and it sounds like you both enriched each other's life. Thats what you should focus on. He was happy.