Well...I'm not gonna be much help...lol
I know that in the winter...the cold..snow..ice...salt mixture can dry a pad out...and that can happen~
But..
Its NOT winter...LOL 
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Only other thing...didn't you say she is chewing and licking her feet?? If she is doing that...could it be just dry from all of that?? gosh...
I'm not sure...
