After seven years of investigating, the Food and Drug Administration still doesn't know what's tainting the jerky treats that have been linked to thousands of pet illness complaints, the organization said Friday.
The snacks, mostly made in China, have been sold by many different companies under various brands, NBC News reported. There's no one product responsible for all of the complaints.
According to FDA complaints, since 2007, 5,600 dogs, 24 cats and three people have reported gastrointestinal, kidney and other symptoms after ingesting the treats.
The three humans affected are two toddlers who accidentally ate the snacks and one adult who may have been munching on them, the FDA said.
In animals, about 60 percent of the treat complaints report gastrointestinal or liver disease, and another 30 percent of complaints are about kidney and urinary disease, WTSP reported.
The remaining 10 percent are about various other symptoms, including neurological and skin conditions.
Still, some Chinese dog treat manufacturers claim their products are safe. Luke Qin, the owner of a Shandong factory, even devoured a duck jerky treat to prove his business’s snacks are harmless, NBC reported.
“Human standard. You can try eating,” he said.
The jerky treats, mostly made in China, have been sold by many different companies under different brand names.
The FDA is teaming up with the Center for Disease Control to further investigate.
"It's quite sad when you see it dawn on the people that they're trying to reward their best buddy there and then now they're the ones who have been making them ill," Brett Levitzke, a New York veterinarian, told NBC.