My Laborador is about 55 days pregnant. We have been watching her closely and about 30mins ago we found that she has a pink balloon like protrusion coming from her vulva. Is this normal or should I be alarmed?

It seems like your dog may be going into labour - if you are alarmed *(which it seems as though you are) contact your vet and make sure - simply give a vet a call they should be able to tell you if she is okay- if you don't have to bring her in you save yourself money and the vet time