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Melamine: Toxicity in Dog Food


Malden Nesheim
Malden Nesheim, PhD

A South African scientist fed daily doses of about 250 mg/kg to sheep, but most animals refused food and lost weight, and some of them died. Another South African investigator gave melamine doses to a single sheep, starting with 2,600 mg/kg. At such high doses, the sheep died within a few days from kidney damage, and the investigators could see crystals of melamine hanging from the animal’s prepuce. Lower doses of melamine caused sheep to stop eating, especially if their water intake was restricted. These studies suggested that a dose of about 250 mg/kg kills some— but not all—sheep over time.So, by 1968, melamine was known to induce kidney damage when fed to sheep over prolonged periods. Ten years later, American investigators tested melamine in cattle and found that a dose of about 100 mg/kg caused four out of six steers to refuse feed.

We think these studies are highly relevant to the pet food situation. The FDA reported that melamine could have accounted for 10 percent of the weight of the false wheat gluten, and the false wheat gluten could have accounted for as much as 10 percent of the weight of the pet food. If so, 100 grams—about 3 ounces—of pet food could have contained as much as a gram (1,000 milligrams) of melamine, and an average cat or small dog could have eaten an amount close to the 250 mg/kg level that proved toxic to sheep in the 1960s.

Recently, investigators from Georgia and the University of California, Davis, have shown that much smaller amounts of melamine can form crystals if cyanuric acid is also present. In cats, doses as low as 32 mg/kg each of melamine and cyanuric acid caused crystallization and kidney blockage.

We were surprised that neither the university or FDA veterinarians involved in the melamine investigations knew about this earlier work, but we think we can guess why. Papers in international journals are not readily accessible on the Internet, and the old animal feed literature is not likely to be studied these days.We had to discover the papers the old-fashioned way, by going to the library in person, sifting through reference lists, following up leads that sometimes required interlibrary loans and pursuing the reference trail back to its origins.We had the interest and time to pursue these questions. For the veterinarians and FDA officials caught up in the heat of the recall, a trip to the library might have seemed like a luxury they could ill afford.

We can’t say whether earlier suspicion of melamine would have hastened the recall or improved veterinary care of the sick dogs and cats.But we can say that the old experiments on animal feeding are well worth reading, that it’s best to read entire papers and not just their abstracts, and that libraries still have much to offer that the Internet cannot.

This article is based on Nestle M., Nesheim M.C. Additional information on melamine in pet food [letter]. JAMVA 231(2007):1647.



This article first appeared in The Bark,
Issue 47: Mar/Apr 2008

Marion Nestle, PhD, is the Paulette Goddard professor of nutrition, food studies and public health at NYU; her most recent book is Pet Food Politics.

Illustration by Heather Horton

CommentsPost a Comment
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Submitted by Anonymous | March 28 2012 |

These are still ongoing issues. The current problems in 2012 with chicken jerky treats, for example. In communications, the FDA claims it cannot order a recall because it hasn't identified the ingredients linked to over 600 North American dog deaths in 2011. The communications from the FDA are published on the Poisoned Pets website.

Given the information in the above article, it seems plausible that the information is available but has not been found by the FDA.

Submitted by Lisa Erickson | June 12 2013 |

My compliments. Looked up this data after noticing my Red Heeler started refusing his usual food which he's never refused before. Also has been acting despondent very unlike him and losing weight while only eating other food offered in lieu of his usual 'Olde Roy' (sp.) purchased at Wal-Mart. Wondered if the 'melamine' in dog food or something similar could be repeating itself in 2013. I have been feeding this brand for many years.

Referring to my email 'handle' I do not necessarily breed dogs but am a pioneer breeder of South African Boer goats in North America having imported embryos and doing two on-farm embryo programs back in 1994. Also a past breeder of Arabian horses so have had a special interest in nutrition, breeding, and especially pharmaceuticals that often bear thoughtful inquiry.

If you learn of other cases being reported or have comment on my current suspicion re my Heeler's behaviour and ongoing food refusals please email me. I only just connected the dots and started realizing there was something wrong with his food and thought of the melamine fiasco. My thanks and again my compliments on the thoroughness of your research. Lisa E.

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