Books in the Guru Guru Pon Chan series

Ponta is immediately drawn to handsome Mirai Iwaki, and even after he discovers that she's really a dog, the two fall head over heels (paws?) in love. When Mirai's ex-girlfriend stands between Ponta and Mirai, the budding relationship sours. Will out-of-body experiences, old flames, and spring fever keep Ponta and Mirai apart?

Ponta is a Labrador retriever puppy who uses the amazing Guru Guru Bone to transform into a human girl.

But when Grandpa Koizumi, an amateur inventor, creates the Guru Guru Bone, Ponta discovers she can use it to turn into a human girl! Ponta quickly meets and falls in love with Mirai Iwaki. Plus Mirai's ex-girlfriend wants him back - by any means necessary. When Mirai and Ponta go to the beach together, the trip turns disastrous.