We live on 15 acres pretty far out in the country and have a free roaming German Shepherd Dog that's quite the guard dog, to say the least. Our driveway is at least 750 feet long from the county road to our garage where I have a "BEWARE OF DOG" sign. Our GSD is friendly to aloof with people, but ferocious towards vehicles. Recently he bit and pierced two front tires of a visiting friend's car as they were parking by our garage. That cost me $350. He's also done this to one tire on my nephew's truck. My nephew...