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  I had that problem when i got Friday b/c she was on low residue puppy food ... and if she got into Monday's food (which was low fat as well), she would get sick.  
 I used to separate them and watch as they ate, but that can get "old" fast.
 
 Now they are on the same low residue puppy food (per vet's instructions and with his permission) ... otherwise, I suggest separating them ... and slowly change them to the same food slowly ....
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