Condolences
Im sorry to hear that you are losing a good friend, it's never easy when a loved one passes on. I have had many animals over the years , and it never gets easier.
But after awhile you realise that the love and companionship they give is worth the pain when they go.
The worst for me was a tan hooded rat I had named Cindy, she was smarter than most people. I trained her from when she was young and she learned everything that I could teach her, she never bit anyone or peed outside of her cage. After 2 years of love and constant friendship, she became ill with cancer. It was throat cancer and was slowly closing off her airway so that she started to die of aphyxiation. I did not have the money to have her put down and had to cease her suffering myself. It was the hardest thing I ever had to do, and I was not the same for many years. I just got over the emotions accosiated with it in the last 3 years and have been able to bring myself to own pets again.
I know have 2 small puppies, and honestly could not concieve of being without them. They make everyday brighter, and make coming home every day almost like cristmas.
I wish you the best with your dear friend linus and hope you both have many more days together, live and love well my friend.
Ejja