From: "Blue"

We just (yesterday) changed her food back to one she has eaten before
without problems to rule out a food source (we cycle her food to give her
some excitement in her diet rather than the same food for years).

She may have developed an allergy to a food she regularly eats. I would advise
a food made specifically for ruling out food allergies. IVD is one food that
comes to mind. Also, you would need to keep her on the food trial for at least
8 weeks. I would recommend talking to a vet who is knowledgeable in this area.

Good luck,
Lauren
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See my cats: http://community.webshots.com/album/56955940rWhxAe
Raw Diet Info: http://www.holisticat.com/drjletter.html
http://www.geocities.com/rawfeeders/ForCatsOnly.html
Declawing Info: http://www.wholecatjournal.com/articles/claws.htm