US can't find cause of pet poison, seeks help

All that's left of Doodles are his ashes, a clay impression of his paw and a whole lot of questions owner Patricia Cassidy has about his mysterious death.
Doodles is believed to be one of 580 dogs in the US that have died in the past six years from eating pet jerky from China.
Baffled by the cause and seeing another surge in illnesses, the Food and Drug Administration reached out to owners and veterinarians Tuesday to help it find the poison behind the sickening of at least 3,600 dogs and 10 cats since 2007.
Within hours of eating the suspect jerky, pets lost their appetite, became lethargic, vomited and had diarrhea and other symptoms. The strips made of chicken, duck, sweet potatoes or dried fruit were sold under a variety of brand names.

There was a decrease in 2007 after some products were voluntarily removed from the market, but the FDA said it didn't want to conduct a recall without a definitive cause.
Those products included Milo's Kitchen Chicken Jerky Treats and Chicken Grillers, made by Del Monte, and Waggin' Train and Canyon Creek Ranch dog treats, made by Nestle Purina.

But in the years since, the FDA has gotten complaints from pet owners and veterinarians who have seen repeated cases of kidney failure, gastrointestinal bleeding, and a rare kidney disorder, the FDA said.
The FDA's Center for Veterinary Medicine has run more than 1,200 tests, visited pet treat manufacturing plants in China and worked with researchers, state labs and foreign governments but hasn't determined the exact cause of the illness.

Testing is complicated because the poison may have come from the manufacturing plant, shipping, transportation or anywhere along the way. Scientists have to know what they're looking for to test for it.