Why does my dog shake like a leaf during thunderstorms?

she hyperventilates and shakes intensely even though she's experienced a thunderstorm every day for nearly two weeks.
she tries to jump on you and licks your feet...can someone explain this fear she has?
Update: well, duh, of course she's scared...but my other dog just snoozes away during thunderstorms while this one tries to hide in the bathtub and squeeze under the couch...
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