This is actually a pretty common question, and there are a few different answers.  First thing is if you see any changes that your dog is going to have to make when the baby gets here start changing now.  If you wait for the baby to be born before you make those changes there is a good chance that the dog will blame the baby for these changes.

An example of some changes would be does your dog sleep in the bed with you, is he/she snappy, and does he/she jump on you?  It will be the most difficult with a dog that is used to being the center of attention.

Other things that you will need to do will be to make the baby’s room off limits and slowly train your dog how to act in baby’s room.  Also teach your dog the difference between baby toys and doggy toys.

Plan ahead, hire someone to come over and walk your dog for the first little while when your baby is born.  This will help you to have some alone time with your baby without worrying about your pup, and will give your pup some time to run around!