How very sad, poor poor baby and my heart goes out to the family.
I have 2 dogs and a 14.5mo DD and a LO on the way. My dogs and my DD are NEVER left alone. I do trust my dogs, but not to the extent of my DD's safety.
Our front and back room have been knocked through and we have a room divider in the archway to keep DD and dogs apart. We also have a tall stair gate at the kitchen door. The dogs spend most of their time in the kitchen and garden (doggy door in back door) and only come into the rooms once DD is safely upstairs in bed.
My brother once said to me that I wasn't fair keeping the dogs out they were here first (he doesn't have DC, can you tell) and that if I think they would ever turn then I should get rid of them.
I don't know if they will ever turn, I do trust them but not 100%, my DD is my one and only priority now. She is getting to that stage of wanting to be with the dogs and play, but she doesn't understand that she cant pull their ears/tails etc, so we keep them apart.
Yes maybe to a small extent dog breed has something to do with it, but I still firmly believe that most of the time it comes down to the owner(s).
My brother has a staffie and he is a lovely dog, but their is something about him (my bro's dog not my bro lol) that I can't quite get to grips with IYSWIM. That is why I insist that if my parents want DD at their house then my brothers dog is not to be there.