on Tue, 14 Nov 2006 15:09:09 GMT, "A&A's Mama" <mommy2twins928@aol.com>
wrote:
> FWIW, I asked my cousin, who has been a vet tech for 12 years and is
> now an animal control officer, about the onion thing and she said
> onions are lethal in birds, but she has never heard of it in cats.
Do a Google search on cats and onions and you will see tons of credible
information about this issue. Onions are definitely toxic to cats.

Signature
Lynne
> FWIW, I asked my cousin, who has been a vet tech for 12 years and is
> now an animal control officer, about the onion thing and she said
> onions are lethal in birds, but she has never heard of it in cats.
>
> Megan
I'm surprised she doesn't know about it. It's been in the literature
for over a decade, I think.
It's actually toxic to both cats and dogs. It causes Heinz Body
Anemia. Here is an article from Univ of Georgia vet school:
http://www.vet.uga.edu/vpp/clerk/Tarigo/
And an excerpt:
"Causes of Heinz Bodies in Cats
There are many substances that induce HzB formation in cats, with or
without the development of anemia including: propofol, acetaminophen,
onions (thiosulfates)..."
Here's a reference she should be able to look up: Robertson JE,
Christopher MM, Rogers QR. Heinz body formation in cats fed baby food
containing onion powder. J Am Vet Med Assoc. 212:1260-1266. 1998.
Heinz body formation in cats fed baby food containing onion powder.
* Robertson JE,
* Christopher MM,
* Rogers QR.
Veterinary Medical Teaching Hospital, School of Veterinary Medicine,
University of California, Davis 95616-8734, USA.
ABSTRACT:
OBJECTIVE: To determine whether cats fed baby food with onion powder
develop Heinz bodies and anemia and to establish a dose-response
relation between dietary onion powder content and Heinz body formation.
DESIGN: Prospective study. ANIMALS: 42 healthy, adult,
specific-pathogen-free cats. PROCEDURE: Commercial baby food with and
without onion powder was fed to 2 groups of 6 cats for 5 weeks. Heinz
body percentage, PCV, reticulocyte percentage, turbidity index, and
methemoglobin and reduced glutathione concentrations were determined
twice weekly and then weekly for 4 weeks following removal of the diet.
For the dose-response study, 5 groups of 6 cats were fed a canned diet
for 2 months that contained 0, 0.3, 0.75, 1.5, or 2.5% onion powder.
Heinz body percentage, PCV, and reticulocyte percentage were determined
twice weekly. RESULTS: Compared with cats fed baby food without onion
powder, cats ingesting baby food with onion powder had significantly
higher Heinz body percentages that peaked at 33 to 53%. Methemoglobin
concentration also significantly increased but did not exceed 1.2%.
Glutathione concentration, PCV, and food intake did not differ between
the 2 groups. Rate and degree of Heinz body formation differed
significantly between various onion powder concentrations fed. Compared
with 0% onion powder, the diet with 2.5% onion powder caused a
significant decrease in PCV and an increased punctate reticulocyte
percentage. CLINICAL IMPLICATIONS: Baby food or other foods containing
similar amounts of onion powder should be avoided for use in cats
because of Heinz body formation and the potential for development of
anemia, particularly with high food intake. Cats with diseases
associated with oxidative stress may develop additive hemoglobin damage
when fed baby food containing onion powder."
HTH,
-L.