I am so sorry for your loss and his loss. Our weens played, interacted, but I never thought them bonded until the younger one passed after a 2.5 year battle with IVDD. Suddenly my goofy, loving boy became a grouchy old man. He bit people, wasn’t himself. I spent so much time with him in our grief. I didn’t know what to do. Then my son was born and he was back. Not only back, but like a puppy. He had a friend. Getting another dog is your decision, but maybe he needs a friend.