Space Dog by Melissa Hosack

Excited to be chosen for the journey of a lifetime, Natalie Inglewood is set for a trip to the moon. She’s been dreaming about this day since she was a little girl. Only once she gets into space, Rory, the other astronaut on board, exhibits a peculiar problem. Unbeknownst to him, it seems Rory has a latent werewolf gene. The closer they get to the moon, the more his beast tries to tear its way out of him. Natalie seems to be the only thing keeping it at bay.

How long can the pair go before things turn dangerous? As Natalie finds herself falling for Rory, she fears what reaching the moon might mean for him. If he shifts while on its surface, he’ll not be able to withstand the moon’s environment. The budding couple has to work together to complete their mission and attempt to somehow make it home safely.