DD4MSpock
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I can add only this. My grandparents left me alone with their dobie "Duchess" when I was 3-4. Never an issue. Granted I was, most likely in a Playpen at the time and Duchess having free reign of the back yard, but.. Of course, as a teen, I was put in charge of "primary care" for Mr. Spock... feeding, walking, clean up, etc. Never an issue. Of course, I can't speak for other dogs. Each personality is different. And I wonder if there's a difference between leaving child and dog alone while "sleeping at night" vs. "other activities when they could be alone together..." I don't recall a time where I ever slept alone with any of the dogs, but we often shared a family room together while we watched TV.
(Rat under some lumber out back that met an unfortunate end
) 
I don't believe you are going to 'get away' from that deeper connection. It's probably already there . And it's not a bad thing actually . I don't know if I'd want to stop the connection just for fear of the end. It's wonderful for children to grow up loving a pet. I understand completely how hard it might be if something happened. But we've all been through that. It's a fact of life. Our daughters cat of 18 years just passed away last year. Their twins are 11 yrs old. The cat was a part of their life from day one. I, myself, cried like a baby here by myself on the phone with my daughter as the cat passed away. My daughter and I spent a long time at a shelter picking out her cat together. She was special to me too. 
Your wife have a good sense of security! Which is a good thing, of course. But sometimes a little misguided. If I may be so bold.
If you had lights on you could not see out but anyone on the outside could see IN! It was stupid!





