Sorry for your loss, Zep. My first, all-of-my-own dog was also a Rufus, a Golden Retriever/Irish Setter mix. He went everywhere with me--a constant companion, often in the back of the pick-up or in the cab when it was too cold or wet. He went up North with me for my year away from the Cape in my mid-twenties. He was a job dog and often beat me to the site after I let him out to do his business in the morning. Like you, losing him was harder than anything I ever went through and I couldn't work for a week--I'd just start tearing up on the job and have to leave.
Your new guy will come around and help fill that empty spot in your life and heart and become your new best friend.
Edit: BTW, I "liked" your post, but wish there was a way to use two emoji's there as in

and

.