Most cases have been dogs, but at least 10 cats have also been struck down with an illness that has confounded federal animal health officials.
Chinese Jerky Dog Treats are also sold under different labels.
Vets and pet owners are now being called on to report new cases as the Food and Drug Administration tries to pinpoint the cause of the sickness.
After eating the treats pets were said to have developed a range of symptons, from gastrointestinal illness to kidney or urinary troubles, according to NBC News.
‘To date, testing for contaminants in jerky treats has not revealed a cause for the illnesses,’ Martine Hartogensis, of FDA’s Center for Veterinary Medicine, said in the new report.
‘Despite these warnings, we have continued to receive reports of illnesses in both cats and dogs,’ she said.
After a spike in deaths and illness in January, the rate of new cases dropped, in part because the two major sellers of chicken jerky treats for pets voluntarily recalled their ranges.
At the time the recalls were said to relate to the presence of an antibiotic residue that was not approved in the U.S.
‘All of us care deeply about pets and their owners, and the quality of our products is of the utmost importance,’ company president Nina Leigh Krueger said in January.
She added that although the antibiotic residue was not deemed a health hazard, the company had voluntarily recalled its products while the investigation continued.
Chinese Jerky Dog Treats are branded with the labels below as well.
Among the products recalled were Nestle Purina PetCare Co’s Waggin Train and Canyon Creek Ranch treats, and Del Monte Corp’s Milo’s Kitchen Chicken Jerky and Chicken Grillers.
The FDA is still unsure as to what is causing the sicknesses and deaths, which have resulted in warnings about the possibility of Fanconi syndrome and other kidney problems.
‘We still are extensively testing treats for a number of things … but we still have a little bit of a way to go,’ Ms Hartogensis said.
Veterinary clinical pathologist Kendal Harr, who has been tracking the problem, admitted experts were stumped.
‘I think that what it tells us is that the intoxicant is something that we’re not used to dealing with as a toxin in North America,’ she said.
Vets have now been asked to send detailed information and blood and urine test results from any animals sickened by jerky treats.
About 60 per cent of cases cite gastrointestinal illness in the animals, and 30 per cent have kidney or urinary troubles, the report said. About 135 cases of Fanconi syndrome, a specific kind of kidney disease, were also reported.
Although officials warned pet owners to feed the treats in small quantities only the agency has not issued a recall yet.
Its response has angered some owners, who feel not enough is being done to safeguard their pets.
Robin Pierre, who blames Waggin’ Train chicken jerky for the death from kidney failure of her two-year-old pug Bella, has been campaigning for the FDA to crackdown on manufactures.
‘They need to start protecting the American consumer so that this does not happen again. As soon as a product is in doubt, a warning label should be placed at the point of sale so that consumers can make an educated choice,’ she said.