Been through that twice now. Third is half way through her life. They truly are a best friend. Never gets any easier. Makes me emotional thinking about the old boys. I feel for you. Just think about how peaceful he rests knowing he had the best life ever.
Do something to honour his memory. I had a custom fly reel made with in the one dogs colours and engraved with his name. Every time I'm out fishing with that reel I remember him, particularly the one time he went floating by as I was focused on the fly. Too funny, but always brings me a smile and peace.