Euthanizing A "vicious" Dog

Three weeks ago, Cedric was euthanized. We had adopted him through a rescue group six months before, knowing that he had been abused. During his brief stay with us, he bonded with me. He liked my husband, but wanted to protect me. He bit my husband once in December (punctures from top and bottom teeth), but we decided that he'd been startled and just went out of our way to keep helping him feel secure. Long story short, he attacked my husband on 4/15. It was a vicious attack with three lunges as my husband turned away and tried to get in another room. The rescue group would take him back but would have to euthanize him, so I decided to have it done myself so I could be with him.

I miss him so much. This is made more difficult because I can't really share it with my husband. He has a very different reaction to the situation. Most of the grief/loss support I've seen had to do with dogs that are elderly or in poor health. Cedric was the picture of perfect physical health. He was only 3. I could use some advice from people who've been in similar situations if possible.