An extra-toes cat isn't a breed. It's any cat born with polydactyly, a harmless genetic variation that adds toes to one or more paws. Most are domestic shorthairs or longhairs, so coats, sizes and personalities cover the whole range, and weight usually falls between 6 and 15 pounds. Many have a mitten-like front paw, and some use it to bat toys or scoop up treats.
The Hemingway nickname comes from the writer Ernest Hemingway, whose six-toed cat started a line that still lives at his Key West home. For Seattle adopters, the practical difference is claw care: extra claws can curl into the paw pads, so plan on regular trims. With good care these cats typically live 12 to 18 years, a long commitment worth planning around if you rent.