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Use "whelping" in a sentence
"Grandma would regularly walk up to the whelping box, survey the scene, and climb in whichever side of the box had the hungriest looking pups."
"Ooohh so your lot are also afflicted with whelping syndrome."
"Shane Brown for The Wall Street Journal Week-old English Bulldog puppies, their eyes not yet open, are kept warm with heating pads and heat lamps in Ms. Himes' whelping house."