I have been feeding merrick's for a long time with no adverse issues. How big is she? She eats a whole cup of that in a day. My female is about 3 lbs and it takes probably two days for her to eat a whole cup. You might be overfeeding her. Maybe it is something to do with her being in heat. We geta bit out of sorts when we are on our cycle. Not sure as my girl is fixed. Good luck.
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