My dog is polydactyly; she has extra toes.
Wow, I've never heard of that before!  How many extra toes does she have?
Three.  It's unusual with dogs, though.  Cats along the East Coast of North America are often polydactyl.
Interesting!  Are there other animals with this phenomenon?
Polydactyly
Polydactyly or polydactylism (), also known as hyperdactyly, is a congenital physical anomaly in humans and animals resulting in supernumerary fingers and/or toes. Polydactyly is the opposite of oligodactyly (fewer fingers or toes).
Signs and symptoms.
In humans/animals this condition can present itself on one or both hands. The extra digit is usually a small piece of soft tissue that can be removed. Occasionally it contains bone without joints; rarely it may be a complete functioning digit. The extra digit is most
large, flat feet — colloquially known as "patty feet" or "hamburger feet". Though this looks less serious than true polydactyly (as the feet appear "normal" apart from having one or two extra toes), breeding such cats will eventually result in severely disabled offspring.
History and folklore.
The condition seems to be most commonly found in cats along the East Coast of North America (in the United States and Canada) Polydactyl cats have been extremely popular as ship's cats. Although there