This is the only way I can make sense of the Egg on the Sulaco.
The Queen wiggled her way into the Dropship. As it makes it's way back onto the Sulaco, the Queen lay's a Queen Egg. I always thought she stashed it in the cavity of the Dropship (altho the picture suggests otherwise).
While everyone is sleeping, the Queen Facehugger emerges. Seeks out the nearest life form, Newt. Now Newt's cryo-tube is flooded upon impact on Fury.
NOW THE FOLLOWING IS DEPICTED IN THE ALIEN 3 COMIC (SEE FOR YOURSELF)
The underdeveloped Queen embryo climbs out of Newt's body and crawls into Ripley's mouth. This I can buy, in all honesty.
It makes sense that the Queen Facehuggers can contain two embroys: A Queen and a Drone. A Drone is necessary to protect the Queen in her vulnerable suspended state and also to bring back hosts for the newly laid eggs. Like people have said, it was chance that the Queen Facehugger grabbed a dog.
How anyone can blame Bishop I do not get at all.