Here are links to three articles on color dilution alopecia (the technical term for "blue born" dogs that are homozygous recessive (dd) at the D Locus:
https://vcahospitals.com/know-your-p...opecia-in-dogs https://wagwalking.com/condition/col...ution-alopecia https://www.vetinfo.com/color-diluti...a-in-dogs.html
None of these articles say that it is lethal. Afflicted dogs are more prone to skin infections, but the condition is manageable. I'm telling this so you don't worry. Again, I don't think your dog is blue born.