Puppies and dogs need to exercise and play to have contact and interaction with both people and other dogs. They should be taught to play with toys only and should learn that human hands, feet or any other body part are not toys. If your pet grabs a hand or foot, either intentionally or accidentally, such behavior should be interrupted by withholding your attention (ignoring them) or by making a high-pitched "ouch" sound. As soon as they let go, offer a large toy and resume playing.

Diane Frank, DVM Diplomate ACVB