actually studies show that the immunity system of babies who lives with pets are way better and stronger than those without. Of course the pets must be kept clean. My LO have been living under the same room as my fluffy Japanese Spitz since born, and she have been healthy! Both are happy and my baby definitely loves to get the attention of my dog. On top of that, its my way to educating my baby on loving, caring and be empathetic towards animals! So it aint a bad thing afterall. (PS: Depends on the temperament of your dog too! )
Maybe you can voice out your concerns with your husband, suggest that they put the dog further away from the vicinity of your room or wherever the baby will be when he/she arrives. Disinfect regularly.