Guru Guru Pon-chan volume 4: v. 4 by Ikezawa, Satomi Paperback Book The Fast
Author:Ikezawa, Satomi. Ponta is a Labrador retriever puppy, the Koizumi family's pet. But when Grandpa Koizumi, an amateur inventor, creates the Guru Guru Bone, Ponta discovers she can use it to turn into a human girl!