Reading Champion Dog Likes to Dig Pink 1A

Reading Champion offers independent reading books for children to practise and reinforce their developing reading skills.
Fantastic, original stories are accompanied by engaging artwork and a reading activity. Each book has been carefully graded so that it can be matched to a child’s reading ability, encouraging reading for pleasure.
Independent Reading Pink 1A stories are perfect for children aged 4+ who are reading at book band 1A (Pink) in classroom reading lessons.

In this story dog keeps digging and digging, what is he looking for?