Pet food scare: Details on recall

"Canadian pet food manufacturer Menu Foods has recalled numerous varieties of pet food made before March 6. Other companies have also issued alerts.

Federal testing of some of the cat and dog food and the wheat gluten used in their production turned up the chemical melamine, which can be toxic in high doses."

Clues to pet food recall traced to Chinese city

"XUZHOU, China: U.S. investigators looking into the tainted pet food that killed at least 16 cats and dogs, sickened thousands of pets and led to a recall in North America have traced the problem to this bustling eastern city."

China rejects blame for pet food recall

"SHANGHAI: China said Thursday that it had no record of exporting any agricultural products that could have tainted the pet food that has been linked to the deaths of at least 16 cats and dogs in the United States."