So sorry for your loss. 4 years ago I had to put down my Golden Retriever. Sadie was 10 years old and just stopped eating one day. Took her to the vet and found out she had stomach and intestinal cancer. Vet gave her some steroids so I could have a few days left with her. I had two before she stopped eating again, had to have her put down. It was very hard to do. About two months later I badly missed having a dog around, so I started looking and wound up with my Boston Terrier, Oliver.
The pain will go away, and while it may not be immediate, it does get better with each passing day. The loyalty and love of a dog makes our bad days better, makes us smile when we are angry and picks us up when we are down.
I am very sorry for your family's loss. You will know when the time is right to get another one!