Most dogs have 16 toes — four on each paw. Some have an extra toe on the back paws. Some like the Great Pyrenees have up to two toes on the back paws.
Back paws William Lawrence Sr Omnibit 2-16-19

News, Entertainment, Enlightenment
Most dogs have 16 toes — four on each paw. Some have an extra toe on the back paws. Some like the Great Pyrenees have up to two toes on the back paws.
Strictly speaking, they have 20 digits, just as we do. The dew claw is a vestigial digit, though granted, it’s not a proper toe.