The Answer is 17

ALIENS INVADED EARTH. Seventeen-year-old Addie attributed survival to their bunker until the generator failed, forcing her and Gibson, their family dog, to hike through the forest toward a safe zone. Gibson was all in at "safe" because protecting Addie is his Golden Rule. Reaching their destination, however, will be his ultimate test as her defender. When their eight-day journey begins, the odds of making it look grim. Winged aliens are lethal hunters. And other survivors are desperate for...