Penny's little dog epitomises the breed. Lively, happy and energetic, he's also exceptionally clever. He relishes being taught tricks by Sheila Finch, Penny's mum, and entertains many of the library visitors. Most of whom come with treats in their pockets ready. He likes to dig and has helped Penny numerous times to unearth a clue or two. Unusually, one thing Fischer doesn't like is water. But this stems from his experience as a young puppy. While not common knowledge it's likely at some point this story will be told.