ABC News has learned that investigators have determined that a rodent-killing chemical
is the toxin in the tainted pet food that has killed several animals.
A source close to the investigation tells ABC News that the rodenticide,
which the source says is illegal to use in the United States,
was on wheat that was imported from China and used by Menu Foods in nearly 100 brands of dog and cat food
"I was shocked and surprised ？ acute kidney failure is not a common problem," veterinarian Cathy Langston told ABC News.
"I've already heard about 200 cases, and so I bet that there are probably going to be thousands."
