You stand up and your dog darts at your ankles. It may look playful, but adult teeth can hurt even without an intent to harm. Some dogs enjoy the moving target, others nip when excited, frustrated, or worried. Watch their whole body and what happens right before the bite.
If the bites break skin, the dog stiffens or growls, or someone cannot move safely through the home, get veterinary and qualified, reward-based behavior help. Keep children and vulnerable people separated from a dog who is nipping. Don't kick, hit, or startle the dog to make the nipping stop.
Give moving feet a different meaning
When the dog is relaxed, have a suitable tug toy ready. Start to walk a step or two. If your dog looks at your feet, pause and invite them to take the toy instead. Reward playing with it, then move again. Keep the first practice short and easy. A dog who can walk beside you or carry a toy without nipping should get attention for that choice.
If nipping starts, stop your feet, avoid a tug with clothing, and calmly create space when safe. Later, note the pattern: does it happen before meals, during fast movement, or after an overstimulating walk? Addressing the buildup may be more useful than reacting at the moment of contact. Give your dog safe outlets for play, sniffing, and rest, and keep exciting games away from hands and feet.
A soft toy in the dog's mouth and a person able to cross the room safely are both part of a better game. You do not need to make yourself a moving chew toy to entertain them. Once everyone is safe from teeth on skin, the high-energy dog play guide offers more ways to channel active play without making your feet the game.
Sources: ASPCA: Mouthing, Nipping and Play Biting in Adult Dogs. Dogs Trust: How to understand your dog's body language.