Kyle shrugged. What was the harm in letting Ally go? Hypnosis was supposed to be embarrassing, so there was no harm if she acted a little bit like a dog. Even if she heard the full-dog trigger, Kyle naively assumed she would just act like a dog. Sure, it might humiliate her, but that was kind of the point.
Still, it would be bad if she forgot how to drive or something. Kyle resolved to call Ally after the party was over, and use the "Barbie Doll" trigger on her. That way, she could safely return home, not realizing what she did at the party. Then afterwards, he could hypnotize her again, and make her divulge all the ways she acted like a dog. Content with that plan of attack, he waved to his sister as she drove off. He smiled, noticing how Ally was sticking her face out the window, enjoying the fresh air.
Meanwhile, Ally was excited about the party. She didn't realize it, but the trigger had amplified her original excitement, making her feel like a dog finally getting to play outside. As she drove, she expressed that joy by sticking her face out of her car window, letting her tongue flop out slightly. It was the most excited she had ever been in her life.
She hadn't under gone any major physical changes, but there were slight alterations to her body. Her tongue had grown a few inches while flattening a bit, although it was still within the realm of human possibility. In addition, her body hair had grown thicker, though this change was concealed by her clothes. More importantly, a small nub had appeared at the base of her spine. It was pushing against her pants, but it was contained within. As she got excited though, it swayed back and forth, wagging happily. Ally was starting to grow a dog tail.