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Try a duck formula of anything, I think wellness has one, some others do as well, not sure on pricing though.
Bascially try changing the protien source in the food.
IF you are feeding a primarily chicken based, try fish or lamb ect.
Going with the vet recommended Hills I think its kangaroo or something you are feeding.( not 100% sure though) but all they are doing is changing your protien source.
YOu are going to have to do a trial and error feeding regime that eliminates certain things from the food.
It does take a few weeks to get the old food completely out of their system to pin point the exact "cause"
If you are feeding treats, stop. Unless you can find treats that also conatain only the protien that you are trying in the food.
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Courage is being scared to death and saddling up anyways. ~John Wayne
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