Hello, and thanks for writing in.
There is going to be some individual variation from dog to dog, in regards to their anatomy.
There can sometimes be a bit of a "stair-step" in the vaginal area.
This does not necessarily mean she will have a difficult time giving birth.
It's quite rare for a Lab to have birthing problems.
If Molly has not already had X-rays of her pelvis, you could get this done to get a better idea if her pelvic canal is narrower than normal (which would be unusual in her breed).
It would be a very good idea to have your veterinarian examine Molly, just to make sure there are no structural or anatomic abnormalities that could interfere with giving birth.
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