"I've always wondered how it is to be a dog," he confesses. You both look at the officer, who just sits there waiting for you to decide his faith. You smile and point at him with the keys. The germen shepherd starts getting up to run away, but the sound of a "Click!" and a white flash of light catches him before he can react. The light fades, and the officer is gone.
"What have you done?!" shouts Keith panicly. "You've just made him disappear!"
"What? No." you say, calming him down. "I'm not that cruel. I de-changed him and teleported him back home, with no memories of ever meeting us today."
"Oh," says Keith, his terrified face returning to normal state. "You got me really worried there, man."
You tilt the keys in front of his eyes. "So, about you becoming a dog... are you sure you want to do this?"
"Yeah, it seems really interesting. And besides, what can go wrong? You can always turn me back if it's seems like something bad's gonna happen. You've always been my best friend, and I think it'll be really fun to be your dog for a while."
"So, what exactly do you want it to be? I mean, i get it that you want to be a dog, but of what breed? And for how long?"
"How about..."