
I would try to get your partner more involved with your dogs day to day routine. He shoukld start to take him for walks, feed him etc, in other words cool your relationship a bit, as when the baby is born you will not be as available to him as you are now, and if he is already used to less of your time it will be easier for him.
By the time he could knock a baby over he will bea bout 3 years old, as of course for at leat 6 months a baby will be in arms and pretty safe from any accidental knocking.
Many people will bring home used items of the baby's clothing for the dog to smell befoe you bring aby home. when you get home give him the oppriotunity to smell the baby but do not be too tense, and do not react one way or the other to his reactions which may vary from disinterest to OTT excitement, growling (anything unfamiliar and worrying will elicit this response, it soesn't mean he hates the baby).
Of course never leave a dog or any animal alkone with a baby, theya re only animals after all, and some will get distreessedexcited when a baby cries.
My freind whose baby is now 6 months has two young Dobermanns, one less than 18 months when baby born and the other a year older. The male is a bit of a bull in the China shop and will no doubt have to be watched carefully while baby learns to walk etc, as even now he lays his heavy head on his lap. Th bitch is very gentle only wanting to mother him and lick him if he dribbles or is sick :D You have to play it by ear acting normal, but always sensibley avoiding any situatiuon that could cause a problem.
Once you have a toddler it is really protecting the dog from them and teaching the baby how to respect and not hurt the dog.