(NBC NEWS) When Zoe, a 3-year-old pit bull mix, showed up sick last week at a Coral Springs, Fla., animal hospital, veterinarian Sofia Morales said there was no mystery about what was wrong with the dog.

The first clue was that Zoe had all the signs of Fanconi syndrome, a rare and often fatal illness that arises from kidney problems. The second was that she’d been eating jerky pet treats made in China, which have been linked to the disorder.

“Fanconi is so rare, that when you see it, your mind goes, ‘boom,’ the treats,” said Morales, who has treated three dogs with the problem in the past year, far more than one vet should expect.

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