This could also be caused by allergies in food. Curly had the same symptoms, and after trial and error I found that she was allergic to Chicken, corn, and Febreeze. She also has small bits of dryness from beef. There are many allergy threads in Health on this if you'd like to check them out.
Also, can you tell us about yourself? The mods will want more of an intro to approve you to the rest of the board.
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