Hi Jenny
Try not to worry to much!!! I know what your thinking, your thinking "easy for her to say, she doesn't even know my dog." But cheer up this is most likely going to pass. My BC was a little like this when he was younger but not as extreme as your describing. Try spending as much of your free time as you can exercising your dog. This is very very important!! Also make it perfectly clear to your BC that RUNNING AWAY IS NOT A GAME! Give her a firm NO,a whack on the butt, anything to let her know that you mean business. The same thing goes for the chewing and the snaping. But remember to let her know that you forgive her and that she is still loved! Best of luck to the both of you!
Jess( :
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Jessica
Cinti,OH