The Runaway. Alison Hart

Scooter, Maryellen's pudgy pet dachshund, may be lazy, but he's one of the family, and Maryellen loves him dearly. And he never misses a meal! So when Scooter doesn't show up at dinnertime, she's worried. Maryellen launches a search and discovers some strange goings-on in her neighborhood. With the help of her friends and family, the search for Scooter takes Maryellen from the streets of Daytona Beach to the rocket launchpad at Cape Canaveral!