Katy padded sleekly around her room. She liked the feeling of being a dog, and especially of being a bitch. She was in heat, and the feeling of intense sexual craving was like nothing she had ever known. She licked her own pussy for a while, the sweet scent magnified a thousand times to her sensitive canine nose.
She was thinking of how to get out of her room when she heard the sound of footsteps coming up the stairs and her mother's voice cry out, "Katy! Katy dear! I really should show you where to find some fresh towels."
Katy panicked. She couldn't let her mother find her like this. She scratched wildly at the collar with her rear paw as her mother's steps grew closer. Just as she undid the latch, the doorknob began to turn, She hurled her dog body forcefully against the door to block it, then shook the loosened collar off her neck.
Katy quickly began morphing back into hersel, her jowls receding, the hair fading back into her skin. As soon as she felt her throat could make human sounds, she grunted in a half-bark, "Just a second, Mom!"
As she became her human self, she quickly threw on her robe and kicked the collar under the bed.