"It's a fear reaction," McCutchen said. "She's trying to get as far away as possible."
Since Rosa is so fearful, the shelter staffers have tried to give her space. But one person - the shelter's trainer, Glen Hatchell - has managed to get close to Rosa.
About a week ago, Hatchell went into Rosa's kennel to give her some attention. When he was patting her, his fingers trailed across her belly - and he figured out that Rosa was keeping a secret. She was pregnant.