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A greater sensitivity of cats to a chemical found in plastics and pesticides could explain why they've died in larger numbers than have dogs after eating contaminated pet food, experts said Saturday.

The small number of confirmed reports of pet deaths bolstered by a far larger number of unconfirmed anecdotal reports suggests cats were more susceptible to poisoning by the chemical melamine that tainted the now recalled pet food, officials with the Food and Drug Administration and American Society for the Prevention of Cruelty to Animals said Saturday.

"I am concerned we have a situation where we have a sensitive species and it is the cat," said Steven Hansen, a veterinary toxicologist and director of the ASPCA's Animal Poison Control center in Urbana, Ill.