They got the kids into the back seat first, and then he went back for the suitcases. When the dog got loose, he considered running after it for a minute, but came to his senses when he saw the first few zombies start shuffling in their direction.
With the car doors shut, they were safe for the moment. Lydia turned and climbed halfway into the back seat to get the kids strapped in. He watched the zombies converge on the car. Lydia called over her shoulder, “Go!”
How would he tell her he had left the keys in the house?