My friend Toni had a litter of Corgis in October, her bitch's second litter. She did all the necessary health testing and the sire was from a well known breeder, but she lost 4 of 6 pups in the first two weeks. It turned out they had soft palates that were too long, so milk was being aspirated into their lungs when they nursed from the mom. I had never heard of such a thing!
What a heartbreak. She did everything to save them, spent a fortune and brought some to work so she could carefully bottle feed every two hours. We were all stroking their bellies and cheering when they pooped, so we were very sad as well.
The remaining two pups will only be sold to buyers who agree to neuter. Toni would keep them, but she already has 5 Corgis and one mutt!! (All of them are treated as members of the family and she only breeds the one female.)
Anyway, I thought palatoschisis might describe this condition, but it doesn't sound like. They weren't cleft, just too long.
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Linda, proud mother of:
Gilroy - 5 y.o. brindle male, natural ears, gentle as a lamb

Purdy - 5 y.o. spayed flashy brindle, natural ears and tongue
Michaela, Boss and Tonka, waiting at the bridge