Check the pet store - they have sprays for keeping animals away that you can use around the perimiter of the car...they'll find another place to go and you'll be fine.
We have a Pixie-Bob cat: 7 toes on the front paws and 6 on the rears - she opens cabinets, doors, etc. and needless to say, we keep her nails trimmed. She loves to climb & jump but the spray around the vehicles works.
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