The mouse:
Made of Lion Brand Fisherman's Wool, and stuffed with Cosmic Catnip from PetSmart.
Pyewacket fell in love:
Dinah was less interested, but I don't know if it was real disinterest, or just because she thought Pyewacket had stolen the limelight. She did deign to play just a little.
But Pye really loved it.
Thanks to Wendy for the idea and the pattern!