Well, it was renal failure killed some pets, <a href="http://www.cbsnews.com/stories/2007/03/26/earlyshow/contributors/debbyeturner/main2607739.shtml"they list some symptoms here</a>. I don't know if anyone's been awarded damages or vet costs, some cases the connection hasn't been shown. The substance was aminopterin and supposedly it could not have gotten into the food by accident. I don't know how long it stays detectable in a pet's body who survives the stuff.