Really you should know by now if one of your cats has a food allergy, they usually have spots on their face and symptoms similar to human's.

And yes, it's really difficult finding a pet food without corn. But most cats eat it and don't have any problems. It is like with egg. Many human meals has egg and many people are allergic to it, look the list of ingredients in most cans or boiled ham. But most people can eat it without problems.

Finding a good food at a affordable cost is very difficult. I can't help you in that

There are better quality happy mediums, but you have to look for them, they don't have the marketing that purina does. Most of their advertising is word of mouth. Purina One is probably the best known grocery store brand, and  their healthiest product. (I'm no fan of Purina, too much of their budget goes to advertising and not into their products IMO) Happy hunting.

My cats own my house they just permit me to live there.

Only cat lovers know the luxury of fur-coated, musical hot water bottles that never go cold."
- Susanne Millen

Nicky's Mom

Never feed your pet:

 1.) alcohol                           11.) grapes                       

 2.) apple cores                     12.) ham

 3.) avacados                        13.) liver

 4.) bones                             14.) milk

 5.) caffiene                          15.) moldy foods

 6.) cheese                           16.) mushrooms

 7.) chocolate                        17.) onions

 8.) dough                             18.) potato peels

 9.) fat                                 19.) raisins

10.) garlic                             20.) tuna

I hope this list helps you and all the other cat moms & dads.

Naughty Kitty

Some of the things on that list don't make sense. potato peels? In culinary school we had a course that was dedicated to potatoes, rice, and pasta cooking; the entire nutritional value of a potato is the skin, after that, it's all sugars, water and starches. Apple cores?

As for allergies, it could be the corn or it could be they dye used in the food, that frequently causes allergies.  I've had several dogs who were allergice to red food coloring (bald pekingese is a pathetic sight indeed).

My cats own my house they just permit me to live there.

Only cat lovers know the luxury of fur-coated, musical hot water bottles that never go cold."
- Susanne Millen

Maybe apple cores are on there because that's where the seeds are? And the seeds contain a small amount of cyanide. One apple's worth of seeds wouldn't hurt your pet, but a lot of apple seeds could add up to enough cyanide to be toxic.

Cheese is also a good training treat for dogs, and a tiny bite won't hurt a cat. You don't want to go overboard, of course, or your pet might have an upset tummy, but it's perfectly safe in moderation.

Fat? I guess you shouldn't pour bacon grease on your pet's food, but fat is necessary in their diets.

Tuna is also safe. Cats should not eat a diet of ONLY tuna, but it's fine as an occasional treat.

That is an unusual list of do-not-feed foods for pets. Here's a more conventional list: http://www.msnbc.msn.com/id/24544541/?GT1=43001

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Educate, don't amputate! Don't de-claw your cat!

http://www.declawing.com/

http://www.pawsneedclaws.com/

My sisters dog begs for apple slices.

My cats own my house they just permit me to live there.

Only cat lovers know the luxury of fur-coated, musical hot water bottles that never go cold."
- Susanne Millen

We also had a dog which managed to sneak into the living room and devour a fairly sizeable box of chocolates one Christmas when we all went to midnight mass and didn't close the kitchen door tightly enough. We did expect it to upset his stomach, even though the toxicit