I agree with all the advice you have gotten. We had 2 springers, that we raised from puppies. ChiChi was 14.5 when I put her down, due to degenerative spine and Hamlet was 13.5 when he died suddently from pancreatic cancer. Over the course of their lives, I was never bitten by Hamlet, but was by ChiChi 3 different times. Once was when I had gotten up to let them out in the middle of the night and walking back to bed, in the dark, after giving them each a biscuit, she bit me in the knee. I screamed, she dropped to the floor. She had apparently mistaken me brushing against her, for Hamlet. I had puncture wounds in my knee, front and back. It hurt like the devil. She bit me once when I was brushing her and apparently hit a bad matt, that I couldn't see and didn't know was there. She bit me once at the vets, when they gave her a shot. Her canine went through my thumbnail and the end of my thumb. Luckily, other than losing the nail, it healed fine. Both of my dogs were wonderful dogs and fantastic with both my children growing up and my grandchildren. They would lay on a blanket on the floor, with my grandson between them. They were very patient, with little fingers poking, pulling ears and tongues, etc. After ChiChi got older, I never let the babies crawl around near her, due to her orthopedic issues and the pain she was sometimes in, but other than that, I trusted her with them completely. They are wonderful, protective dogs, that I think are great family dogs. I sincerely hope you and your husband are able to come to terms with what has happened and see that this was an isolated incident. Accidents happen and dogs make mistakes, just like we do. A few incidents of this nature, do not make a bad or unpredictable dog. Unfortunately, most of us tend to forget, from time to time, that as much as we love and pamper our dogs, they are still animals and do not react like human beings do. They do not think as we do, nor do they react in the same way. We have a hard time getting into their heads and understanding what they are thinking and why they sometimes react in the ways they do. The one thing I have learned from my dogs is that they do not hold grudges against each other or me and I have to work at not holding things against them. Mine can be growling and snarling at me one minute and licking my hand the next. Everything has to be taken into context and studied from their point of view. Good luck.
Kathy