How long does a puppy nip for?
Puppy biting is a normal, natural, and necessary puppy behavior. Puppy play-biting is the means by which dogs develop bite inhibition and a soft mouth. The developing puppy should learn that his bites can hurt long before he develops jaws strong enough to inflict injury. Check this link for more guidelines. http://dogtime.
until you teach it no that is how long. Wear socks and teach your dog NO, by saying a stern no and act like you are going to hit it but don’t and put it outside,leave it outside for five minutes. This should work. Then Teaching it to not attack your feet get a training collar also known as a choker collar but it will not choke or hurt your puppy. Get a really really long rope tie it to the loop on the collar and hold the rope and get the toddler to run and if the puppy chases and tries to get the feet pull the rope before it gets the feet($) and tell it No!
