This happens all of the time when a pup is surrounded in the uterus with decaying amniotic fluid and placenta. How this is news is beyond me. Its rare alright, about once a week rare.
A dog lover & owner and I have never heard of it. The photos were amazing & I learned something & thought it was a great little news story.
Unsure why you seem so bitter about a charming story. I’m glad it was posted. I bookmarked it to show my mother whom I am visiting.