They typically have five nails on each paw, with the fifth one being located higher up on the inside of the paw and called the dewclaw.
* Dewclaws are often considered vestigial, meaning they've lost their original function over time. In some breeds, dewclaws are functional and used for balance and grip.
* Front paws usually have a dewclaw, while back paws may or may not have one, depending on the breed.
So, the statement about dogs having only four nails is inaccurate.