18. Dogs have four main claws or toes on each paw with two additional claws or toes on their front paws sometimes called Dewclaws or Dew Claws. So adding them up; 5 claws on each front leg and 4 on each hind leg for a total of 18 claws or toes if you wish,
Some dogs also have Dewclaws on their hind feet, so depending on the dog it could be anywhere from 16 to 20 "toes".
Sometimes the Dewclaws are just the claw and can be easily removed, but if they are fully connected by bone then it's more complicated & costly.