Tainted Pet Food Affected Thousands Pets

Scientists have extrapolated that 39,000 cats and dogs may have been affected by the tainted pet food, based on data received by 615 hospitals. The scientists believe that three out of every 10,000 cats and dogs was affected by the tainted pet food. Cats seem to have been more affected by the tainted food than dogs.

Banfield, The Pet Hospital, said an analysis of its database, compiled from records collected by its more than 615 veterinary hospitals, suggests that three out of every 10,000 cats and dogs that ate the pet food contaminated with melamine developed kidney failure. There are an estimated 60 million dogs and 70 million cats in the United States, according to the American Veterinary Medical Association.

The hospital chain saw 1 million dogs and cats during the three months when the more than 100 brands of now-recalled contaminated pet food were sold. It saw 284 extra cases of kidney failure among cats during that period, or a roughly 30 percent increase, when compared with background rates.

"It has meaning, when you see a peak like that. We see so many pets here, and it coincided with the recall period," said veterinarian Hugh Lewis, who oversees the mining of Banfield's database to do clinical studies. The chain continues to share its data with the Food and Drug Administration.

FDA officials previously have said the database compiled by the huge veterinary practice would probably provide the most authoritative picture of the harm done by the tainted cat and dog food.

From its findings, Banfield officials calculated an incidence rate of .03 percent for pets, although there was no discernible uptick among dogs. That suggests the contamination was overwhelming toxic to cats, Lewis said. That is in line with what other experts have said previously.