There are quite a few complaints from people whose pets got sick on dry kibble from Nutro. I'm wondering if it's one of their ingredients? They have Menadione Sodium Bisulfite Complex in it (vitamin K3)
I looked at the Menadione (Vitamin K3) article on dogfoodproject.com and looked at a list of negative effects caused by K3, and looked up some of the vocab on Wiki....
is directly toxic in high doses (vomiting, albuminuria), unlike natural vitamin K
albuminuria is "....a pathological condition where albumin is present in the urine. It is a type of proteinuria." Albuminuria can be an indicator of damage to the kidneys. Sophie and Max, the two italian greyhounds in the article, was diagnosed with Kidney failure after eating the food. All of the dogs that died from eating this food that I have read about were vomiting after eating Nutro.
has no effect on coumarin derivatives, which are often present in commercial food due to mold contamination (toxic when ingested)
Susie, Blue's owner, said that when she picked up a bag of Nutro, "'...it looked like it had little white bugs all over it," said Susi, a longtime Nutro customer. "When I picked up the food, it was like a granular substance. But I didn't think much about it because the food wasn't part of the recall.'"
All the dogs that were affected by Nutro suffered from vomiting, lethargy, and were drinking a lot of water. I looked up some complaints on consumeraffairs.com on other foods that contains menadione, and came out with this...
Two champion bloodline Bichon Frise died. Both were eating Purina.
“She [one of the dogs] was a healthy 12-month-old Bichon Frise,” says Julie, who breeds and shows Bichon Frise. “But then she suddenly started drinking excessive amounts of water, was vomiting, and became very lethargic.”
There are other possible causes, such as aflatoxin. You can read the article here....
http://www.consumeraffairs.com/news04/2007/09/pet_food_recalls70.html
Another negative effect of Menadione is
possible mutagenic effects
Here is an article about newfoundland breeders who are having breeding problems, including 'mutant puppies'. All of them feed Purina.
https://www.consumeraffairs.com/news04/2007/07/pet_food_recalls62b.html
I know K3 was harmful, but I didn't think the side effects would take place so quickly. 
Well, that's my take on it, anyway. Hope I got the medical stuff right. I tried looking up 'cytotoxicity in liver cells', but I couldn't understand all the fancy terms on wiki. I haven't heard of these things happening and being directly linked food that doesn't have Menadione as of yet. There could be something else wrong, like moldy food or what not. What do you think?
Excuse any spelling mistakes...
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