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If Roo is having severe diarrhea when fed the baby food exclusively then she should have testing at your vet to determine if she has intestinal disease and she should be started on medication if indicated. \
Roo should also have a more restricted food elimination trial.
For a strict diagnostic food elimination trial, the cat must go off all the ingredients it now eats or has ever eaten. All cat foods, canned and dry, all table foods, and all treats. Read all the ingredients on the labels. Anything that is in any of those foods the cat cannot have during the trial. If there is chicken or poultry meal, it cannot have chicken. If there is corn, it cannot have corn. If there is fish, it cannot have fish. This is not switching from one food brand to another, this is switching to ingredients that your cat has never had contact with.
For the 4-6 weeks the cat is going to be on the food trial, it is often easiest to use cooked meats, lunch meat, or strained meat baby foods. You can use whatever meat is NOT in your cat’s current or previous diet. Your veterinarian will have many novel protein and hydrolyzed protein diets available to use in this trial. Feed exclusively for 4-6 weeks. If all signs resolve, you have confirmed diet as the cause. It is extremely important that the cat eat adequately while on this trial. A cat will never get "hungry enough" to eat something it does not want.
To be effective you must be religious about this so that food as a cause is eliminated.
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