My vet has seen dogs go into anaphylactic shock and die from allergy to rabies. 
You just never know.  With all the processed diets we are feeding our dogs and potentially not getting the proper nutrition to maintain a healthy immune system I don't find it surprising that more and more dogs are having issues with these vaccines. 
Remember it's a live vaccine and if your dogs system can't handle it, these awful things can happen.  Touch wood for your baby and hopefully you don't have anything to worry about     |