Double or Nothing written and illustrated by Phoebe Erickson, 1st Scholastic paperback printing, TX1168, 1968, 111 pages.
DESCRIPTION:“‘Two of them!’ cries Ellen. ‘No wonder we keep seeing black dogs!’
‘What do we do now?,’ asks her brother Jeff. ‘Mother and Father will never let us keep both.’
‘I know,’ says Ellen. ‘We’ll only let them see one dog at a time. We’ll always keep one hidden.’ But it’s not so easy to hide a frisky dog. And Ellen and Jeff soon find themselves in double trouble.