Dog Aliens 1: Raffle's Name

All dogs lead secret alien lives after their humans leave for work or school. (for kids aged 9-12) Happy Ending Clem digs out of his yard every day and follows the scent messages to go help his pack of 'big dogs' mine, which is the reason the dog aliens are here on Earth.
Despite themselves, dog aliens have formed the habit of bonding with humans, which compels the aliens to please the humans. But humans don't like the digging.