Chihuahua puppy question?

Ok so I found 2 chihuahuas on Craigslist I went and pick them up and took them to the vet to find out the female was pregnant. Skip forward a few months and my chihuahua had 4 puppys I re homed the puppy’s at 9 weeks old. And I had one of the new owners call me 4 days after gettin the puppy saying the puppy... show more Ok so I found 2 chihuahuas on Craigslist I went and pick them up and took them to the vet to find out the female was pregnant. Skip forward a few months and my chihuahua had 4 puppys I re homed the puppy’s at 9 weeks old. And I had one of the new owners call me 4 days after gettin the puppy saying the puppy wouldn’t move and puking and had no energy. Mind u this dog was full of life and energy at my house. They take the dog to the vet an the vet says they wanna put the dog down because it’s sugar levels were at 9!! My question is could this happen in 4 days? The puppy was eating regular soft puppy food at my house :(
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