He makes her an anthro dog.

Maybe it was some perverted sentiment from good memories of previous ones he’d one, maybe it was the endless optimism, or maybe it was the kind of fetish that didn’t really have a concrete explanation. Whatever it was, Tom’s favorite type of furry art had always been about dogs, and now he could make that weird, perverted dream a reality. Of course, ‘dog-girl’ was a pretty broad idea. A lot of variety came with it. Was it just a sexy girl with dog ears and maybe a dog tail? Or something more like that one artist’s style, all furry and more dog than human? Of course, Tom knew exactly what type he’d like to see Sarah become.

Thinking of exactly what he wanted for his wife’s next transformation, Tom rubbed the coin and thought, ‘I wish that, tomorrow morning, my wife will wake-up having transformed into the exact type of anthro dog-girl I’m imagining. She won’t question why, and she’ll have mental changes to fit her new body as well.’ The wish done, Tom went through the rest of his day almost on auto-pilot. Even when Sarah got home, and they had some pretty passionate lovemaking, his mind was still on what he’d find the next day.