Why does my 12 yr old chihuaha chew at the pads on her feet until the entire foot and pads look blood red?

Why does my 12 yr old chihuaha chew at the pads on her feet until her entire foot/pads, (even down in between the pads)are blood red, (but don't appear upon inspection to be bleeding, and there's nothing in them). It's not always the same foot either. It's almost like a nervous thing.

Your chihuaha probably has something irritating the pads of her feet or has something in-between the pads and her foot.

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