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How to introduce a dog to a new family member
Sign up for dog obedience classes.
You should sign up for dog obedience classes well in advance of your due date, so that your dog is well trained and prepared for the new family member. At the obedience classes you could ask other people about their experiences of introducing dogs to new family members.
You could ask your local pet store if they know about good obedience classes in your neighborhood. You could check if there is an american kennel club that offers obedience training in your area.