 Based on analysis of data collected by more than 600 hospitals and clinics in 43 states, out of every 10,000 cats and dogs seen in Banfield clinics, three developed kidney failure during the time pet food contaminated with melamine was on the market.They reported 284 more cases of kidney failure in cats than the expected "background rate," corresponding to a 30 percent increase.During that period, the Banfield vets saw 100,000 cats.