I am a gundog trainer and the everything here that people say is pretty much bang-on, the only extra thing I would def do is find an old t-shirt that you don't mind losing, sleep in it and then when your baby is born rub it on the baby/leave the baby sleeping on it so that it smells of both of you and baby and then let your OH take it home and let the dogs sleep on it - this helps it to become their smell and a smell that is not alien by the time you get your LO home.
My only other advice is NEVER leave your dog alone with your baby, it is not fair to put that kind of responsibility on them - they may never mean to intentionally hurt your baby but you never know what they are thinking or feeling - especially if you have bitches as they are often overtaken by their natural instincts: I have met a woman whose lovely dog bit her baby because the baby had a wet nappy and the bitch was trying to take her nappy off and in the process nipped her on the arm - bitches can't bear the smell of wee and poo as with their own pups they would eat it/lick them to keep their nest and puppies clean, in the case of the woman above she kept the dog but the dog lived outside from then on - the poor dog was only doing what her instincts told her to.
I'm not trying to scare anyone because dogs and babies can be fab together and I have every intention of keeping all our dogs inside and around the baby however, sometimes I think we put too much responsibility on our animals when actually we shouldn't put them in that kind of position in the first place, especially as we can't explain to them whats going on!!
Good luck - I can't wait for my dogs to meet the new addition to our family! x